diff --git a/src/MiniMap.cpp b/src/MiniMap.cpp
index e79a2af4..0bd30e53 100644
--- a/src/MiniMap.cpp
+++ b/src/MiniMap.cpp
@@ -210,7 +210,7 @@ int MiniMapLoop(void)
 	return enum_ESCRETURN_continue;
 }
 
-char gMapping[0x80];
+signed char gMapping[0x80];
 
 BOOL IsMapping(void)
 {
diff --git a/src/MiniMap.h b/src/MiniMap.h
index add3aee5..38639877 100644
--- a/src/MiniMap.h
+++ b/src/MiniMap.h
@@ -2,7 +2,7 @@
 
 #include "WindowsWrapper.h"
 
-extern char gMapping[0x80];
+extern signed char gMapping[0x80];
 
 int MiniMapLoop(void);
 BOOL IsMapping(void);