diff --git a/GPU/Common/GPUStateUtils.cpp b/GPU/Common/GPUStateUtils.cpp
index e26498ae91..f16f69cd7e 100644
--- a/GPU/Common/GPUStateUtils.cpp
+++ b/GPU/Common/GPUStateUtils.cpp
@@ -1171,7 +1171,13 @@ void ConvertBlendState(GenericBlendState &blendState, bool allowShaderBlend) {
 			break;
 		}
 	} else if (!IsStencilTestOutputDisabled()) {
-		switch (ReplaceAlphaWithStencilType()) {
+		StencilValueType stencilValue = ReplaceAlphaWithStencilType();
+		if (stencilValue == STENCIL_VALUE_UNIFORM && constantAlpha == 0x00) {
+			stencilValue = STENCIL_VALUE_ZERO;
+		} else if (stencilValue == STENCIL_VALUE_UNIFORM && constantAlpha == 0xFF) {
+			stencilValue = STENCIL_VALUE_ONE;
+		}
+		switch (stencilValue) {
 		case STENCIL_VALUE_KEEP:
 			blendState.setFactors(glBlendFuncA, glBlendFuncB, BlendFactor::ZERO, BlendFactor::ONE);
 			break;