diff --git a/libguile/deprecation.c b/libguile/deprecation.c
index 08227071f..aa50eaf8c 100644
--- a/libguile/deprecation.c
+++ b/libguile/deprecation.c
@@ -34,12 +34,6 @@
 
 #include "libguile/private-options.h"
 
-
-/* Windows defines. */
-#ifdef __MINGW32__
-#define vsnprintf _vsnprintf
-#endif
-
 
 
 struct issued_warning {