diff --git a/GPU/Common/FragmentShaderGenerator.cpp b/GPU/Common/FragmentShaderGenerator.cpp
index e52a458607..e4e101f1d7 100644
--- a/GPU/Common/FragmentShaderGenerator.cpp
+++ b/GPU/Common/FragmentShaderGenerator.cpp
@@ -864,7 +864,7 @@ bool GenerateFragmentShader(const FShaderID &id, char *buffer, const ShaderLangu
 
 		if (enableFog) {
 			WRITE(p, "  float fogCoef = clamp(v_fogdepth, 0.0, 1.0);\n");
-			WRITE(p, "  v = mix(vec4(u_fogcolor, v.a), v, fogCoef);\n");
+			WRITE(p, "  v.rgb = mix(u_fogcolor, v.rgb, fogCoef);\n");
 		}
 
 		// Texture access is at half texels [0.5/256, 255.5/256], but colors are normalized [0, 255].