diff --git a/source/MaterialXRenderGlsl/GlslProgram.cpp b/source/MaterialXRenderGlsl/GlslProgram.cpp
index eecab8036e..d592a7df8c 100644
--- a/source/MaterialXRenderGlsl/GlslProgram.cpp
+++ b/source/MaterialXRenderGlsl/GlslProgram.cpp
@@ -1040,9 +1040,9 @@ int GlslProgram::mapTypeToOpenGLType(const TypeDesc* type)
 {
     if (type == Type::INTEGER)
         return GL_INT;
-    else if (type == Type::BOOLEAN)
+    else if (type->getName() == Type::BOOLEAN->getName())
         return GL_BOOL;
-    else if (type == Type::FLOAT)
+    else if (type->getName() == Type::FLOAT->getName())
         return GL_FLOAT;
     else if (type->isFloat2())
         return GL_FLOAT_VEC2;
@@ -1050,9 +1050,9 @@ int GlslProgram::mapTypeToOpenGLType(const TypeDesc* type)
         return GL_FLOAT_VEC3;
     else if (type->isFloat4())
         return GL_FLOAT_VEC4;
-    else if (type == Type::MATRIX33)
+    else if (type->getName() == Type::MATRIX33->getName())
         return GL_FLOAT_MAT3;
-    else if (type == Type::MATRIX44)
+    else if (type->getName() == Type::MATRIX44->getName())
         return GL_FLOAT_MAT4;
     else if (type == Type::FILENAME)
     {