diff --git a/source/detail/stylesheet.hpp b/source/detail/stylesheet.hpp
index b2697844..8427e17b 100644
--- a/source/detail/stylesheet.hpp
+++ b/source/detail/stylesheet.hpp
@@ -65,11 +65,6 @@ struct stylesheet
 {
     ~stylesheet() {}
     
-    std::size_t index(const format &f) 
-	{ 
-		return ::index(formats, f);
-	}
-    
     std::size_t index(const std::string &style_name)
     {
         auto match = std::find_if(styles.begin(), styles.end(),
diff --git a/source/styles/color.cpp b/source/styles/color.cpp
index 870cb930..376092e0 100644
--- a/source/styles/color.cpp
+++ b/source/styles/color.cpp
@@ -22,6 +22,8 @@
 // @license: http://www.opensource.org/licenses/mit-license.php
 // @author: see AUTHORS file
 
+#include <cstdlib>
+
 #include <xlnt/styles/color.hpp>
 #include <xlnt/utils/exceptions.hpp>
 
@@ -163,7 +165,7 @@ std::string rgb_color::get_hex_string() const
 
 std::array<std::uint8_t, 4> rgb_color::decode_hex_string(const std::string &hex_string)
 {
-	auto x = strtoul(hex_string.c_str(), NULL, 16);
+	auto x = std::strtoul(hex_string.c_str(), NULL, 16);
 
 	auto a = static_cast<std::uint8_t>(x >> 24);
 	auto r = static_cast<std::uint8_t>((x >> 16) & 0xff);
diff --git a/tests/helpers/path_helper.hpp b/tests/helpers/path_helper.hpp
index 15b44070..ea55761b 100644
--- a/tests/helpers/path_helper.hpp
+++ b/tests/helpers/path_helper.hpp
@@ -30,7 +30,7 @@ public:
 
         if (_NSGetExecutablePath(path.data(), &size) == 0)
         {
-            return std::string(path.begin(), std::find(path.begin(), path.end(), '\0') - 9);
+            return xlnt::path(std::string(path.begin(), std::find(path.begin(), path.end(), '\0') - 9));
         }
 
         throw std::runtime_error("buffer too small, " + std::to_string(path.size()) + ", should be: " + std::to_string(size));