diff --git a/src/fileformats.c b/src/fileformats.c
index 2e955821..d7621da6 100644
--- a/src/fileformats.c
+++ b/src/fileformats.c
@@ -34,16 +34,11 @@
 #endif
 
 #include <stdlib.h>
-#if defined(WIN32)
 #if defined(_MSC_VER)
 #include <stdio.h>
 #if _MSC_VER < 1900
 #define snprintf _snprintf
 #endif
-#define WIN32_BSWAP32 _byteswap_ulong
-#else
-#define WIN32_BSWAP32 __builtin_bswap32
-#endif
 #endif
 
 #if !defined(WIN32) && !defined(USE_SDL) && !defined(USE_SDL2)
diff --git a/src/ifformat.c b/src/ifformat.c
index 2d502071..e5e85822 100644
--- a/src/ifformat.c
+++ b/src/ifformat.c
@@ -36,6 +36,14 @@
 #include "gfx2mem.h"
 #include "gfx2log.h"
 
+#if defined(WIN32)
+#if defined(_MSC_VER)
+#define WIN32_BSWAP32 _byteswap_ulong
+#else
+#define WIN32_BSWAP32 __builtin_bswap32
+#endif
+#endif
+
 //////////////////////////////////// IFF ////////////////////////////////////
 /** @defgroup IFF Interchange File Format
  * @ingroup loadsaveformats