diff --git a/crnlib/crn_platform.cpp b/crnlib/crn_platform.cpp
index acae60c9..09c3981f 100644
--- a/crnlib/crn_platform.cpp
+++ b/crnlib/crn_platform.cpp
@@ -5,7 +5,8 @@
 #if CRNLIB_USE_WIN32_API
 #include "crn_winhdr.h"
 #endif
-#ifndef _MSC_VER
+
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
 int sprintf_s(char* buffer, size_t sizeOfBuffer, const char* format, ...) {
   if (!sizeOfBuffer)
     return 0;
@@ -54,7 +55,7 @@ char* strupr(char* p) {
   }
   return p;
 }
-#endif  // __GNUC__
+#endif
 
 void crnlib_debug_break(void) {
   CRNLIB_BREAKPOINT
diff --git a/crnlib/crn_platform.h b/crnlib/crn_platform.h
index 70d8dfd2..cffa6abc 100644
--- a/crnlib/crn_platform.h
+++ b/crnlib/crn_platform.h
@@ -66,7 +66,7 @@ const bool c_crnlib_big_endian_platform = !c_crnlib_little_endian_platform;
 
 #define CRNLIB_GET_ALIGNMENT(v) ((!sizeof(v)) ? 1 : (__alignof(v) ? __alignof(v) : sizeof(uint32)))
 
-#ifndef _MSC_VER
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
 int sprintf_s(char* buffer, size_t sizeOfBuffer, const char* format, ...);
 int vsprintf_s(char* buffer, size_t sizeOfBuffer, const char* format, va_list args);
 char* strlwr(char* p);