diff --git a/indra/llprimitive/llmodel.h b/indra/llprimitive/llmodel.h
index 00273ed3a8eb7d31002eb2dfbc9b461d4a1a9b7d..501cac622ecf668caa2f2d54b4d95742df477f06 100644
--- a/indra/llprimitive/llmodel.h
+++ b/indra/llprimitive/llmodel.h
@@ -327,7 +327,7 @@ class LLImportMaterial final : public LLModelMaterialBase
 protected:
     
     LLUUID		mDiffuseMapID;
-    void*			mOpaqueData;	// allow refs to viewer/platform-specific structs for each material
+    void*		mOpaqueData = nullptr;	// allow refs to viewer/platform-specific structs for each material
     // currently only stores an LLPointer< LLViewerFetchedTexture > > to
     // maintain refs to textures associated with each material for free
     // ref counting.