diff --git a/panda/src/dxgsg8/dxGraphicsStateGuardian8.cxx b/panda/src/dxgsg8/dxGraphicsStateGuardian8.cxx
index 77c1e018f8..2639435431 100644
--- a/panda/src/dxgsg8/dxGraphicsStateGuardian8.cxx
+++ b/panda/src/dxgsg8/dxGraphicsStateGuardian8.cxx
@@ -315,6 +315,7 @@ dx_init(void) {
 
     // these both reflect d3d defaults
     _color_writemask = 0xFFFFFFFF;
+    _CurFVFType = 0x0;  // guards SetVertexShader fmt
 
     _bGouraudShadingOn = false;
     _pD3DDevice->SetRenderState(D3DRS_SHADEMODE, D3DSHADE_FLAT);
diff --git a/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx b/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx
index fde1cf67e9..d6c04f1b93 100755
--- a/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx
+++ b/panda/src/dxgsg9/dxGraphicsStateGuardian9.cxx
@@ -314,6 +314,7 @@ dx_init(void) {
 
     // these both reflect d3d defaults
     _color_writemask = 0xFFFFFFFF;
+    _CurFVFType = 0x0;  // guards SetVertexShader fmt
 
     _bGouraudShadingOn = false;
     _pD3DDevice->SetRenderState(D3DRS_SHADEMODE, D3DSHADE_FLAT);