diff --git a/src/string.cpp b/src/string.cpp
index 29dc221211..55495cd107 100644
--- a/src/string.cpp
+++ b/src/string.cpp
@@ -20,6 +20,11 @@
 #include <ctype.h> /* required for tolower() */
 #include <sstream>
 
+#ifdef _MSC_VER
+#	include <errno.h> // required by vsnprintf implementation for MSVC
+#	define strncasecmp strnicmp
+#endif
+
 #ifdef _WIN32
 #	include "os/windows/win32.h"
 #endif