diff --git a/src/tools/chdman.cpp b/src/tools/chdman.cpp
index 86b406a4393..a3049b1d3c1 100644
--- a/src/tools/chdman.cpp
+++ b/src/tools/chdman.cpp
@@ -5,7 +5,7 @@
     CHD compression frontend
 
 ****************************************************************************/
-
+#include <stdio.h> // must be here otherwise issues with I64FMT in MINGW
 #include <assert.h>
 
 #include "osdcore.h"