diff --git a/src/libGLESv2/renderer/Renderer11.cpp b/src/libGLESv2/renderer/Renderer11.cpp
index 656e014..830cabb 100644
--- a/src/libGLESv2/renderer/Renderer11.cpp
+++ b/src/libGLESv2/renderer/Renderer11.cpp
@@ -738,7 +738,23 @@
                 "blend state.");
         }
 
-        const float blendColors[] = { blendColor.red, blendColor.green, blendColor.blue, blendColor.alpha };
+        float blendColors[4] = {0.0f};
+        if (blendState.sourceBlendRGB != GL_CONSTANT_ALPHA && blendState.sourceBlendRGB != GL_ONE_MINUS_CONSTANT_ALPHA &&
+            blendState.destBlendRGB != GL_CONSTANT_ALPHA && blendState.destBlendRGB != GL_ONE_MINUS_CONSTANT_ALPHA)
+        {
+            blendColors[0] = blendColor.red;
+            blendColors[1] = blendColor.green;
+            blendColors[2] = blendColor.blue;
+            blendColors[3] = blendColor.alpha;
+        }
+        else
+        {
+            blendColors[0] = blendColor.alpha;
+            blendColors[1] = blendColor.alpha;
+            blendColors[2] = blendColor.alpha;
+            blendColors[3] = blendColor.alpha;
+        }
+
         mDeviceContext->OMSetBlendState(dxBlendState, blendColors, sampleMask);
 
         mCurBlendState = blendState;