diff --git a/GPU/Common/FragmentShaderGenerator.cpp b/GPU/Common/FragmentShaderGenerator.cpp
index d7ba9fb96f25..0a182f675a7c 100644
--- a/GPU/Common/FragmentShaderGenerator.cpp
+++ b/GPU/Common/FragmentShaderGenerator.cpp
@@ -469,7 +469,7 @@ bool GenerateFragmentShader(const FShaderID &id, char *buffer, const ShaderLangu
 			}
 			if (enableColorTest && !colorTestAgainstZero) {
 				if (compat.bitwiseOps) {
-					WRITE(p, "uint roundAndScaleTo8x4(in vec3 x) { uvec3 u = uvec3(floor(x * 255.99)); return u.r | (u.g << 0x8u) | (u.b << 0x10u); }\n");
+					WRITE(p, "uint roundAndScaleTo8x4(in vec3 x) { uvec3 u = uvec3(floor(x * 255.92)); return u.r | (u.g << 0x8u) | (u.b << 0x10u); }\n");
 					WRITE(p, "uint packFloatsTo8x4(in vec3 x) { uvec3 u = uvec3(x); return u.r | (u.g << 0x8u) | (u.b << 0x10u); }\n");
 				} else if (gl_extensions.gpuVendor == GPU_VENDOR_IMGTEC) {
 					WRITE(p, "vec3 roundTo255thv(in vec3 x) { vec3 y = x + (0.5/255.0); return y - fract(y * 255.0) * (1.0 / 255.0); }\n");