diff --git a/desmume/src/utils/mkgmtime.cpp b/desmume/src/utils/mkgmtime.cpp
index 253ef050f..6a8ccd019 100644
--- a/desmume/src/utils/mkgmtime.cpp
+++ b/desmume/src/utils/mkgmtime.cpp
@@ -38,6 +38,7 @@
 
 #include <stdlib.h>
 #include <time.h>
+#include "mkgmtime.h"
 
 #define _SEC_IN_MINUTE 60L
 #define _SEC_IN_HOUR 3600L