diff --git a/src/sdl/i_video.c b/src/sdl/i_video.c
index 6bb131777..5e97694ad 100644
--- a/src/sdl/i_video.c
+++ b/src/sdl/i_video.c
@@ -186,13 +186,15 @@ static void Impl_SetWindowIcon(void);
 
 static void Impl_SetSoftwareVsync(int vsync)
 {
-	static int oldvsync = 0;
 #if SDL_VERSION_ATLEAST(2,0,18)
+	static int oldvsync = 0;
 	if (oldvsync != vsync)
 	{
 		SDL_RenderSetVSync(renderer, vsync);
 	}
 	oldvsync = vsync;
+#else
+	(void)vsync;
 #endif
 }