diff --git a/other/BUILD.bazel b/other/BUILD.bazel
index ebfde238..60aab1e0 100644
--- a/other/BUILD.bazel
+++ b/other/BUILD.bazel
@@ -13,6 +13,7 @@ cc_library(
 
 cc_binary(
     name = "DHT_bootstrap",
+    testonly = 1,
     srcs = ["DHT_bootstrap.c"],
     deps = [
         "//c-toxcore/testing:misc_tools",
diff --git a/other/fun/BUILD.bazel b/other/fun/BUILD.bazel
index 4bd26afc..604dce3d 100644
--- a/other/fun/BUILD.bazel
+++ b/other/fun/BUILD.bazel
@@ -4,6 +4,7 @@ package(features = ["layering_check"])
 
 #cc_binary(
 #    name = "cracker",
+#    testonly = 1,
 #    srcs = ["cracker.c"],
 #    copts = ["-fopenmp"],
 #    linkopts = ["-fopenmp"],
@@ -15,6 +16,7 @@ package(features = ["layering_check"])
 
 cc_binary(
     name = "cracker_simple",
+    testonly = 1,
     srcs = ["cracker_simple.c"],
     deps = [
         "//c-toxcore/testing:misc_tools",
@@ -25,6 +27,7 @@ cc_binary(
 
 cc_binary(
     name = "minimal-save-generator",
+    testonly = 1,
     srcs = ["minimal-save-generator.c"],
     deps = [
         "//c-toxcore/toxcore:ccompat",
@@ -34,6 +37,7 @@ cc_binary(
 
 cc_binary(
     name = "sign",
+    testonly = 1,
     srcs = ["sign.c"],
     copts = ["-w"],
     deps = [
@@ -45,6 +49,7 @@ cc_binary(
 
 cc_binary(
     name = "strkey",
+    testonly = 1,
     srcs = ["strkey.c"],
     copts = ["-w"],
     deps = [
@@ -56,6 +61,7 @@ cc_binary(
 
 cc_binary(
     name = "save-generator",
+    testonly = 1,
     srcs = ["save-generator.c"],
     deps = [
         "//c-toxcore/testing:misc_tools",
diff --git a/testing/BUILD.bazel b/testing/BUILD.bazel
index 5441d427..8f8fce5f 100644
--- a/testing/BUILD.bazel
+++ b/testing/BUILD.bazel
@@ -22,6 +22,7 @@ sh_test(
 
 cc_library(
     name = "misc_tools",
+    testonly = 1,
     srcs = ["misc_tools.c"],
     hdrs = ["misc_tools.h"],
     visibility = ["//c-toxcore:__subpackages__"],
@@ -34,6 +35,7 @@ cc_library(
 
 cc_library(
     name = "trace",
+    testonly = 1,
     srcs = ["trace.cc"],
     visibility = ["//c-toxcore:__subpackages__"],
     alwayslink = True,
@@ -41,6 +43,7 @@ cc_library(
 
 cc_binary(
     name = "DHT_test",
+    testonly = 1,
     srcs = ["DHT_test.c"],
     deps = [
         ":misc_tools",
@@ -53,6 +56,7 @@ cc_binary(
 
 cc_binary(
     name = "Messenger_test",
+    testonly = 1,
     srcs = ["Messenger_test.c"],
     deps = [
         ":misc_tools",
@@ -63,6 +67,7 @@ cc_binary(
 
 cc_binary(
     name = "random_testing",
+    testonly = 1,
     srcs = ["random_testing.cc"],
     deps = [
         ":misc_tools",