diff --git a/src/main/haiku/SDL_BeApp.cc b/src/main/haiku/SDL_BeApp.cc
index c2976f6d4..e755a6cad 100644
--- a/src/main/haiku/SDL_BeApp.cc
+++ b/src/main/haiku/SDL_BeApp.cc
@@ -45,7 +45,7 @@ extern "C" {
 #include "../../thread/SDL_systhread.h"
 
 /* Flag to tell whether or not the Be application is active or not */
-int SDL_BeAppActive = 0;
+static int SDL_BeAppActive = 0;
 static SDL_Thread *SDL_AppThread = NULL;
 
 static int
diff --git a/src/main/haiku/SDL_BeApp.h b/src/main/haiku/SDL_BeApp.h
index f05af93b9..ba81adaab 100644
--- a/src/main/haiku/SDL_BeApp.h
+++ b/src/main/haiku/SDL_BeApp.h
@@ -31,8 +31,6 @@ extern int SDL_InitBeApp(void);
 /* Quit the Be Application, if there's nothing left to do */
 extern void SDL_QuitBeApp(void);
 
-/* Flag to tell whether the app is active or not */
-extern int SDL_BeAppActive;
 /* vi: set ts=4 sw=4 expandtab: */
 
 #ifdef __cplusplus