diff --git a/core/fxge/dib/cfx_scanlinecompositor.cpp b/core/fxge/dib/cfx_scanlinecompositor.cpp
index 4c6d741..ac73b24 100644
--- a/core/fxge/dib/cfx_scanlinecompositor.cpp
+++ b/core/fxge/dib/cfx_scanlinecompositor.cpp
@@ -91,8 +91,9 @@
                                     : back_color - src_color;
     case BlendMode::kExclusion:
       return back_color + src_color - 2 * back_color * src_color / 255;
+    default:
+      return src_color;
   }
-  return src_color;
 }
 
 struct RGB {
@@ -173,6 +174,8 @@
     case BlendMode::kLuminosity:
       result = SetLum(back, Lum(src));
       break;
+    default:
+      break;
   }
   results[0] = result.blue;
   results[1] = result.green;