diff --git a/GPU/GLES/StateMapping.cpp b/GPU/GLES/StateMapping.cpp
index 24618200f5..f1c9269381 100644
--- a/GPU/GLES/StateMapping.cpp
+++ b/GPU/GLES/StateMapping.cpp
@@ -407,21 +407,18 @@ void TransformDrawEngine::ApplyDrawState(int prim) {
 		bool rmask = (gstate.pmskc & 0xFF) < 128;
 		bool gmask = ((gstate.pmskc >> 8) & 0xFF) < 128;
 		bool bmask = ((gstate.pmskc >> 16) & 0xFF) < 128;
+		bool amask = (gstate.pmska & 0xFF) < 128;
 
-		bool amask;
-		ReplaceAlphaType stencilToAlpha = ReplaceAlphaWithStencil();
-
-		switch (stencilToAlpha) {
-		case REPLACE_ALPHA_DUALSOURCE:
-		case REPLACE_ALPHA_NO:
-			amask = (gstate.pmska & 0xFF) < 128;
-			break;
-
-		case REPLACE_ALPHA_YES:
-			amask = true;
-			break;
-
+		// Let's not write to alpha if stencil isn't enabled.
+		if (!gstate.isStencilTestEnabled()) {
+			amask = false;
+		} else {
+			// If the stencil type is set to KEEP, we shouldn't write to the stencil/alpha channel.
+			if (ReplaceAlphaWithStencilType() == STENCIL_VALUE_KEEP) {
+				amask = false;
+			}
 		}
+
 		glstate.colorMask.set(rmask, gmask, bmask, amask);
 
 		// Stencil Test