diff --git a/sc2/src/sc2code/libs/reslib.h b/sc2/src/sc2code/libs/reslib.h
index e327f6935..d826ff6a0 100644
--- a/sc2/src/sc2code/libs/reslib.h
+++ b/sc2/src/sc2code/libs/reslib.h
@@ -49,7 +49,7 @@ typedef COUNT RES_PACKAGE;
 		((RESOURCE)(i) << TYPE_BITS) | \
 		((RESOURCE)(t)))
 
-extern FILE *OpenResFile (PVOID filename, char *mode);
+extern FILE *OpenResFile (PVOID filename, const char *mode);
 extern int ReadResFile (PVOID lpBuf, COUNT size, COUNT count, FILE *fp);
 extern int WriteResFile (PVOID lpBuf, COUNT size, COUNT count, FILE
 		*fp);
diff --git a/sc2/src/sc2code/libs/resource/filecntl.c b/sc2/src/sc2code/libs/resource/filecntl.c
index d8337958e..abf5dcee6 100644
--- a/sc2/src/sc2code/libs/resource/filecntl.c
+++ b/sc2/src/sc2code/libs/resource/filecntl.c
@@ -26,8 +26,8 @@
 #include <sys/stat.h>
 #include "resintrn.h"
 
-FILE
-*OpenResFile (PVOID filename, char *mode)
+FILE *
+OpenResFile (PVOID filename, const char *mode)
 {
 	FILE *fp;
 	struct stat sb;