diff --git a/src/hardware/r_opengl/r_opengl.c b/src/hardware/r_opengl/r_opengl.c
index 5d252a698..ce4465644 100644
--- a/src/hardware/r_opengl/r_opengl.c
+++ b/src/hardware/r_opengl/r_opengl.c
@@ -2232,7 +2232,7 @@ EXPORT void HWRAPI(DrawIntermissionBG)(void)
 }
 
 // Do screen fades!
-EXPORT void HWRAPI(DoScreenWipe)()
+EXPORT void HWRAPI(DoScreenWipe)(void)
 {
 	INT32 texsize = 2048;
 	float xfix, yfix;
@@ -2257,8 +2257,6 @@ EXPORT void HWRAPI(DoScreenWipe)()
 		1.0f, 1.0f
 	};
 
-	(void)alpha;
-
 	// Use a power of two texture, dammit
 	if(screen_width <= 1024)
 		texsize = 1024;