diff --git a/include/QF/mathlib.h b/include/QF/mathlib.h
index e657522c6..746b40499 100644
--- a/include/QF/mathlib.h
+++ b/include/QF/mathlib.h
@@ -135,7 +135,7 @@ void RotatePointAroundVector (vec3_t dst, const vec3_t axis,
 
 extern	mplane_t	frustum[4];
 
-#ifndef IMPLEMENT_R_CullBox
+#ifndef IMPLEMENT_R_Cull
 extern inline
 #endif
 qboolean
@@ -149,7 +149,7 @@ R_CullBox (const vec3_t mins, const vec3_t maxs)
 	return false;
 }
 
-#ifndef IMPLEMENT_R_CullSphere
+#ifndef IMPLEMENT_R_Cull
 extern inline
 #endif
 qboolean
diff --git a/libs/util/mathlib.c b/libs/util/mathlib.c
index 38fa2fe2a..74b08e408 100644
--- a/libs/util/mathlib.c
+++ b/libs/util/mathlib.c
@@ -39,8 +39,7 @@ static const char rcsid[] =
 
 #include <math.h>
 
-#define IMPLEMENT_R_CullBox
-#define IMPLEMENT_R_CullSphere
+#define IMPLEMENT_R_Cull
 
 #include "QF/mathlib.h"
 #include "QF/qtypes.h"