diff --git a/code/AssetLib/XGL/XGLLoader.cpp b/code/AssetLib/XGL/XGLLoader.cpp
index 0ef5943c0..3590b9441 100644
--- a/code/AssetLib/XGL/XGLLoader.cpp
+++ b/code/AssetLib/XGL/XGLLoader.cpp
@@ -598,7 +598,7 @@ bool XGLImporter::ReadMesh(XmlNode &node, TempScope &scope) {
 	}
 
 	// finally extract output meshes and add them to the scope
-	typedef std::pair<unsigned int, TempMaterialMesh> pairt;
+	typedef std::pair<const unsigned int, TempMaterialMesh> pairt;
 	for (const pairt &p : bymat) {
 		aiMesh *const m = ToOutputMesh(p.second);
 		scope.meshes_linear.push_back(m);