diff --git a/components/shader/shadervisitor.cpp b/components/shader/shadervisitor.cpp
index cb0173c648..cbd2863e46 100644
--- a/components/shader/shadervisitor.cpp
+++ b/components/shader/shadervisitor.cpp
@@ -458,7 +458,7 @@ namespace Shader
             defineMap[texIt->second + std::string("UV")] = std::to_string(texIt->first);
         }
 
-        if (defineMap["diffuseMap"] == 0)
+        if (defineMap["diffuseMap"] == "0")
             writableStateSet->addUniform(new osg::Uniform("useDiffuseMapForShadowAlpha", false));
 
         defineMap["parallax"] = reqs.mNormalHeight ? "1" : "0";