diff --git a/auto_tests/TCP_test.c b/auto_tests/TCP_test.c
index bc684af9..769ba5de 100644
--- a/auto_tests/TCP_test.c
+++ b/auto_tests/TCP_test.c
@@ -18,13 +18,6 @@
 
 #include "helpers.h"
 
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-#define c_sleep(x) Sleep(1*x)
-#else
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-#endif
-
 #define NUM_PORTS 3
 
 static uint16_t ports[NUM_PORTS] = {1234, 33445, 25643};
diff --git a/auto_tests/conference_test.c b/auto_tests/conference_test.c
index 36707e0f..33110441 100644
--- a/auto_tests/conference_test.c
+++ b/auto_tests/conference_test.c
@@ -17,15 +17,6 @@
 
 #include "helpers.h"
 
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-#include <windows.h>
-#define c_sleep(x) Sleep(1*x)
-#else
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-#endif
-
-
 #define NUM_GROUP_TOX 32
 
 static void g_accept_friend_request(Tox *m, const uint8_t *public_key, const uint8_t *data, size_t length,
diff --git a/auto_tests/dht_test.c b/auto_tests/dht_test.c
index 479b0eb8..6ed84098 100644
--- a/auto_tests/dht_test.c
+++ b/auto_tests/dht_test.c
@@ -571,14 +571,6 @@ static void ip_callback(void *data, int32_t number, IP_Port ip_port)
 {
 }
 
-
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-#define c_sleep(x) Sleep(1*x)
-#else
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-#endif
-
 #define NUM_DHT_FRIENDS 20
 
 START_TEST(test_DHT_test)
diff --git a/auto_tests/helpers.h b/auto_tests/helpers.h
index 5cec575c..e5860449 100644
--- a/auto_tests/helpers.h
+++ b/auto_tests/helpers.h
@@ -7,6 +7,14 @@
 #include <check.h>
 #include <stdio.h>
 
+#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
+#include <windows.h>
+#define c_sleep(x) Sleep(x)
+#else
+#include <unistd.h>
+#define c_sleep(x) usleep(1000*(x))
+#endif
+
 #define DEFTESTCASE(NAME)                   \
     TCase *tc_##NAME = tcase_create(#NAME); \
     tcase_add_test(tc_##NAME, test_##NAME); \
diff --git a/auto_tests/onion_test.c b/auto_tests/onion_test.c
index 05264927..c52bbb58 100644
--- a/auto_tests/onion_test.c
+++ b/auto_tests/onion_test.c
@@ -18,13 +18,6 @@
 
 #include "helpers.h"
 
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-#define c_sleep(x) Sleep(1*x)
-#else
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-#endif
-
 static void do_onion(Onion *onion)
 {
     networking_poll(onion->net, NULL);
diff --git a/auto_tests/save_friend_test.c b/auto_tests/save_friend_test.c
index 6d0640c3..061425bd 100644
--- a/auto_tests/save_friend_test.c
+++ b/auto_tests/save_friend_test.c
@@ -12,14 +12,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-#include <windows.h>
-#define c_sleep(x) Sleep(1*x)
-#else
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-#endif
-
 struct test_data {
     uint8_t name[TOX_MAX_NAME_LENGTH];
     uint8_t status_message[TOX_MAX_STATUS_MESSAGE_LENGTH];
diff --git a/auto_tests/tox_many_tcp_test.c b/auto_tests/tox_many_tcp_test.c
index 48f5671c..77c611d9 100644
--- a/auto_tests/tox_many_tcp_test.c
+++ b/auto_tests/tox_many_tcp_test.c
@@ -17,14 +17,6 @@
 
 #include "helpers.h"
 
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-#include <windows.h>
-#define c_sleep(x) Sleep(1*x)
-#else
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-#endif
-
 /* The Travis-CI container responds poorly to ::1 as a localhost address
  * You're encouraged to -D FORCE_TESTS_IPV6 on a local test  */
 #ifdef FORCE_TESTS_IPV6
diff --git a/auto_tests/tox_many_test.c b/auto_tests/tox_many_test.c
index b44bbb0c..1a1a715d 100644
--- a/auto_tests/tox_many_test.c
+++ b/auto_tests/tox_many_test.c
@@ -17,14 +17,6 @@
 
 #include "helpers.h"
 
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-#include <windows.h>
-#define c_sleep(x) Sleep(1*x)
-#else
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-#endif
-
 static void accept_friend_request(Tox *m, const uint8_t *public_key, const uint8_t *data, size_t length, void *userdata)
 {
     if (*((uint32_t *)userdata) != 974536) {
diff --git a/auto_tests/tox_test.c b/auto_tests/tox_test.c
index d9074ac0..f3557226 100644
--- a/auto_tests/tox_test.c
+++ b/auto_tests/tox_test.c
@@ -27,14 +27,6 @@
 
 #include "helpers.h"
 
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-#include <windows.h>
-#define c_sleep(x) Sleep(1*x)
-#else
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-#endif
-
 /* The Travis-CI container responds poorly to ::1 as a localhost address
  * You're encouraged to -D FORCE_TESTS_IPV6 on a local test  */
 #ifdef FORCE_TESTS_IPV6
diff --git a/auto_tests/toxav_basic_test.c b/auto_tests/toxav_basic_test.c
index 79f552de..2885d8be 100644
--- a/auto_tests/toxav_basic_test.c
+++ b/auto_tests/toxav_basic_test.c
@@ -22,15 +22,6 @@
 #include "../toxcore/util.h"
 
 
-#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
-#include <windows.h>
-#define c_sleep(x) Sleep(1*x)
-#else
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-#endif
-
-
 #define TEST_REGULAR_AV 1
 #define TEST_REGULAR_A 1
 #define TEST_REGULAR_V 1
diff --git a/auto_tests/toxav_many_test.c b/auto_tests/toxav_many_test.c
index 1a10db44..83a7b313 100644
--- a/auto_tests/toxav_many_test.c
+++ b/auto_tests/toxav_many_test.c
@@ -21,16 +21,10 @@
 #include "../toxcore/tox.h"
 #include "../toxcore/util.h"
 
-#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
-#include <windows.h>
-#define c_sleep(x) Sleep(1*x)
-#else
+#if !defined(_WIN32) && !defined(__WIN32__) && !defined(WIN32)
 #include <pthread.h>
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
 #endif
 
-
 typedef struct {
     bool incoming;
     uint32_t state;
diff --git a/other/DHT_bootstrap.c b/other/DHT_bootstrap.c
index f4dd5a65..78139de0 100644
--- a/other/DHT_bootstrap.c
+++ b/other/DHT_bootstrap.c
@@ -50,15 +50,6 @@
 #define DHT_MOTD "This is a test motd"
 #endif
 
-/* Sleep function (x = milliseconds) */
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-#define c_sleep(x) Sleep(1*x)
-#else
-#include <arpa/inet.h>
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-#endif
-
 #define PORT 33445
 
 
diff --git a/testing/DHT_test.c b/testing/DHT_test.c
index 536217fe..6e65bf3a 100644
--- a/testing/DHT_test.c
+++ b/testing/DHT_test.c
@@ -41,16 +41,8 @@
 
 #include <string.h>
 
-//Sleep function (x = milliseconds)
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-
-#define c_sleep(x) Sleep(1*x)
-
-#else
+#if !defined(_WIN32) && !defined(__WIN32__) && !defined (WIN32)
 #include <arpa/inet.h>
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-
 #endif
 
 #define PORT 33445
diff --git a/testing/Messenger_test.c b/testing/Messenger_test.c
index c1a63da8..7dc773b2 100644
--- a/testing/Messenger_test.c
+++ b/testing/Messenger_test.c
@@ -47,15 +47,8 @@
 #include "../toxcore/Messenger.h"
 #include "misc_tools.c"
 
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-
-#define c_sleep(x) Sleep(1*x)
-
-#else
+#if !defined(_WIN32) && !defined(__WIN32__) && !defined (WIN32)
 #include <arpa/inet.h>
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-#define PORT 33445
 
 #endif
 
diff --git a/testing/av_test.c b/testing/av_test.c
index 8aaebfe7..4d09d023 100644
--- a/testing/av_test.c
+++ b/testing/av_test.c
@@ -73,7 +73,7 @@ extern "C" {
 #include <time.h>
 #include <unistd.h>
 
-#define c_sleep(x) usleep(1000*x)
+#define c_sleep(x) usleep(1000*(x))
 
 
 #define CLIP(X) ((X) > 255 ? 255 : (X) < 0 ? 0 : X)
diff --git a/testing/dns3_test.c b/testing/dns3_test.c
index 821f3b4b..4c03fc52 100644
--- a/testing/dns3_test.c
+++ b/testing/dns3_test.c
@@ -3,15 +3,6 @@
 #include "../toxdns/toxdns.h"
 #include "misc_tools.c"
 
-#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-
-#define c_sleep(x) Sleep(1*x)
-
-#else
-#define c_sleep(x) usleep(1000*x)
-
-#endif
-
 static uint32_t create_packet(uint8_t *packet, uint8_t *string, uint8_t str_len, uint8_t id)
 {
     memset(packet, 0, str_len + 13 + 16);
diff --git a/testing/misc_tools.c b/testing/misc_tools.c
index f0e12526..f6e76e46 100644
--- a/testing/misc_tools.c
+++ b/testing/misc_tools.c
@@ -31,6 +31,15 @@
 #include <stdlib.h>
 #include <string.h>
 
+//Sleep function (x = milliseconds)
+#if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
+#include <windows.h>
+#define c_sleep(x) Sleep(x)
+#else
+#include <unistd.h>
+#define c_sleep(x) usleep(1000*(x))
+#endif
+
 // You are responsible for freeing the return value!
 uint8_t *hex_string_to_bin(const char *hex_string)
 {
diff --git a/testing/nTox.c b/testing/nTox.c
index d02a1652..73038622 100644
--- a/testing/nTox.c
+++ b/testing/nTox.c
@@ -48,10 +48,10 @@
 #include <time.h>
 
 #if defined(_WIN32) || defined(__WIN32__) || defined (WIN32)
-#define c_sleep(x) Sleep(1*x)
+#define c_sleep(x) Sleep(x)
 #else
 #include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
+#define c_sleep(x) usleep(1000*(x))
 #endif
 
 static void new_lines(char const *line);
diff --git a/testing/tox_shell.c b/testing/tox_shell.c
index f983f4e9..43e0b544 100644
--- a/testing/tox_shell.c
+++ b/testing/tox_shell.c
@@ -43,9 +43,6 @@
 #include <pty.h>
 #endif
 #include <fcntl.h>
-#include <unistd.h>
-
-#define c_sleep(x) usleep(1000*x)
 
 static void print_online(Tox *tox, uint32_t friendnumber, TOX_CONNECTION status, void *userdata)
 {
diff --git a/testing/tox_sync.c b/testing/tox_sync.c
index d2fc41ca..10fc047e 100644
--- a/testing/tox_sync.c
+++ b/testing/tox_sync.c
@@ -38,9 +38,6 @@
 #include "../toxcore/tox.h"
 #include "misc_tools.c"
 
-#include <unistd.h>
-#define c_sleep(x) usleep(1000*x)
-
 #include <arpa/inet.h>
 #include <dirent.h>
 #include <netinet/in.h>