diff --git a/src/video/x11/SDL_x11mouse.c b/src/video/x11/SDL_x11mouse.c
index 7c0d80043..3689abb61 100644
--- a/src/video/x11/SDL_x11mouse.c
+++ b/src/video/x11/SDL_x11mouse.c
@@ -61,6 +61,7 @@ X11_InitMouse(_THIS)
     }
 
     /* we're getting the list of input devices */
+    n = 0;
     DevList = XListInputDevices(display, &n);
 
     /* we're aquiring valuators: mice, tablets, etc. */