diff --git a/libraries/gpu-gl/src/gpu/gl/GLShader.h b/libraries/gpu-gl/src/gpu/gl/GLShader.h
index 40dd0b7be9..07a17f458d 100644
--- a/libraries/gpu-gl/src/gpu/gl/GLShader.h
+++ b/libraries/gpu-gl/src/gpu/gl/GLShader.h
@@ -40,10 +40,14 @@ public:
         return _shaderObjects[version].glprogram;
     }
 
-    GLint getUniformLocation(GLint srcLoc, Version version = Mono) {
+    GLint getUniformLocation(GLint srcLoc, Version version = Mono) const {
         // THIS will be used in the future PR as we grow the number of versions
-        return _uniformMappings[version][srcLoc];
-       // return srcLoc;
+        const auto& mapping = _uniformMappings[version];
+        auto found = mapping.find(srcLoc);
+        if (found == mapping.end()) {
+            return -1;
+        }
+        return found->second;
     }
 
     const std::weak_ptr<GLBackend> _backend;