diff --git a/similar/main/gamecntl.cpp b/similar/main/gamecntl.cpp
index 8b8385dc7..cddea9baa 100644
--- a/similar/main/gamecntl.cpp
+++ b/similar/main/gamecntl.cpp
@@ -112,6 +112,14 @@ COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
 
 #include <SDL.h>
 
+#if defined(__GNUC__) && defined(WIN64)
+/* Mingw64 _mingw_print_pop.h changes PRIi64 to POSIX-style.  Change it
+ * back here.
+ */
+#undef PRIi64
+#define PRIi64 "I64i"
+#endif
+
 using std::min;
 
 // Global Variables -----------------------------------------------------------