diff --git a/src/c64_class.cpp b/src/c64_class.cpp
index dd2cf27..37e068f 100755
--- a/src/c64_class.cpp
+++ b/src/c64_class.cpp
@@ -1814,7 +1814,7 @@ void C64Class::SetFullscreenAspectRatio(bool enable)
 void C64Class::AnalyzeSDLEvent(SDL_Event *event)
 {
     static bool joy_center_flag = true;
-    static char joy_axis_tbl[5] = {1,1,0,0,-1};
+    static signed char joy_axis_tbl[5] = {1,1,0,0,-1};
 
     SDL_Keymod keymod;