diff --git a/renderdoc/driver/d3d11/d3d11_replay.h b/renderdoc/driver/d3d11/d3d11_replay.h
index a7a722641..9aff49a83 100644
--- a/renderdoc/driver/d3d11/d3d11_replay.h
+++ b/renderdoc/driver/d3d11/d3d11_replay.h
@@ -362,9 +362,9 @@ private:
     ID3D11GeometryShader *MeshGS = NULL;
     ID3D11PixelShader *WireframePS = NULL;
     ID3D11PixelShader *MeshPS = NULL;
-    ID3D11Buffer *AxisHelper;
-    ID3D11Buffer *FrustumHelper;
-    ID3D11Buffer *TriHighlightHelper;
+    ID3D11Buffer *AxisHelper = NULL;
+    ID3D11Buffer *FrustumHelper = NULL;
+    ID3D11Buffer *TriHighlightHelper = NULL;
     ID3D11InputLayout *GenericLayout = NULL;
 
     byte *MeshVSBytecode = NULL;