diff --git a/GPU/Software/Clipper.cpp b/GPU/Software/Clipper.cpp
index 2a2a53b28a..f07f64614e 100644
--- a/GPU/Software/Clipper.cpp
+++ b/GPU/Software/Clipper.cpp
@@ -31,17 +31,14 @@ namespace Clipper {
 
 enum {
 	SKIP_FLAG = -1,
-	CLIP_POS_Z_BIT = 0x10,
 	CLIP_NEG_Z_BIT = 0x20,
 };
 
-static inline int CalcClipMask(const ClipCoords& v)
-{
-	int mask = 0;
+static inline int CalcClipMask(const ClipCoords &v) {
 	// This checks `x / w` compared to 1 or -1, skipping the division.
-	if (v.z > v.w) mask |= CLIP_POS_Z_BIT;
-	if (v.z < -v.w) mask |= CLIP_NEG_Z_BIT;
-	return mask;
+	if (v.z < -v.w)
+		return -1;
+	return 0;
 }
 
 inline bool different_signs(float x, float y) {