diff --git a/api/x_opengl.C b/api/x_opengl.C
index 42ca731de4..3ee15cc2e2 100644
--- a/api/x_opengl.C
+++ b/api/x_opengl.C
@@ -64,7 +64,7 @@ enum
 }; // possible longjmp-values to signal from where we jumped:
 // 1= exit caught by atexit, 2 = signal caught by handler
        
-bool xwin_glut_is_initialized() { return glut_is_initialized; }
+int xwin_glut_is_initialized() { return glut_is_initialized; }
 
 void app_debug_msg (char *fmt, ...);
 
diff --git a/api/x_opengl.h b/api/x_opengl.h
index 7235f3e7fe..06abd66990 100644
--- a/api/x_opengl.h
+++ b/api/x_opengl.h
@@ -5,7 +5,7 @@
 extern "C" {
 #endif
 
-extern bool xwin_glut_is_initialized();  
+extern int xwin_glut_is_initialized();  
 
 #ifdef __cplusplus
 }