diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8df466cb5..6abf9fa97 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -194,7 +194,6 @@ REQUIRE_CXX_SOURCE_COMPILES("template<class... T> class C; int main() { return 0
 # time, so the test below works.
 REQUIRE_CXX_SOURCE_COMPILES("#include <regex>\nint main() { std::cregex_iterator ri; }" HAVE_WORKING_REGEX " If you are using gcc, please update to gcc 4.9.")
 check_cxx_symbol_exists(vasprintf stdio.h HAVE_VASPRINTF)
-check_cxx_symbol_exists(__mingw_vasprintf stdio.h HAVE___MINGW_VASPRINTF)
 
 ############################################################################
 # Check for required system headers
diff --git a/config.h.cmake b/config.h.cmake
index af2a6ccd9..aa8ead2e0 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -74,9 +74,6 @@
 /* Define to 1 if you have the `vasprintf' function. */
 #cmakedefine HAVE_VASPRINTF 1
 
-/* Define to 1 if you have the `__mingw_vasprintf' function. */
-#cmakedefine HAVE___MINGW_VASPRINTF 1
-
 /* Define to 1 if you have the <X11/extensions/Xrandr.h> header file. */
 #cmakedefine HAVE_X11_EXTENSIONS_XRANDR_H 1
 
diff --git a/src/lib/Standard.h b/src/lib/Standard.h
index 906e17f8e..6bceeb631 100644
--- a/src/lib/Standard.h
+++ b/src/lib/Standard.h
@@ -155,6 +155,10 @@ bool SWildcardMatchEx(const char *szString, const char *szWildcard);
 #include <cstdio>
 #include <cstdarg>
 
+#ifdef _WIN32
+#define vsnprintf _vsprintf_p
+#endif
+
 // old, insecure sprintf
 inline int osprintf(char *str, const char *fmt, ...) GNUC_FORMAT_ATTRIBUTE_O;
 inline int osprintf(char *str, const char *fmt, ...)
diff --git a/src/lib/StdBuf.cpp b/src/lib/StdBuf.cpp
index 6e89e8ae1..90d6107ca 100644
--- a/src/lib/StdBuf.cpp
+++ b/src/lib/StdBuf.cpp
@@ -24,7 +24,6 @@
 #ifdef _WIN32
 #include <io.h>
 #include "platform/C4windowswrapper.h"
-#define vsnprintf _vsprintf_p
 #else
 #define O_BINARY 0
 #define O_SEQUENTIAL 0
@@ -35,14 +34,6 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 
-#if !defined(HAVE_VASPRINTF) && defined(HAVE___MINGW_VASPRINTF)
-// MinGW declares a vasprintf-compatible function as __mingw_vasprintf.
-// Rename it for our use.
-#define vasprintf __mingw_vasprintf
-#define HAVE_VASPRINTF
-#endif
-
-
 // *** StdBuf
 
 bool StdBuf::LoadFromFile(const char *szFile)
diff --git a/src/script/C4AulCompiler.cpp b/src/script/C4AulCompiler.cpp
index 9fa1a0e7e..39ceacf1a 100644
--- a/src/script/C4AulCompiler.cpp
+++ b/src/script/C4AulCompiler.cpp
@@ -29,10 +29,6 @@
 #define C4AUL_SafeInherited "_inherited"
 #define C4AUL_DebugBreak    "__debugbreak"
 
-#ifdef _MSC_VER
-#define vsnprintf _vsprintf_p
-#endif
-
 static std::string vstrprintf(const char *format, va_list args)
 {
 	va_list argcopy;