diff --git a/renderdoc/driver/gl/gl_renderstate.cpp b/renderdoc/driver/gl/gl_renderstate.cpp
index 6612e68d7..100e97dba 100644
--- a/renderdoc/driver/gl/gl_renderstate.cpp
+++ b/renderdoc/driver/gl/gl_renderstate.cpp
@@ -1672,7 +1672,8 @@ void GLRenderState::ApplyState(WrappedOpenGL *driver)
 
   if(HasExt[ARB_tessellation_shader])
   {
-    GL.glPatchParameteri(eGL_PATCH_VERTICES, PatchParams.numVerts);
+    if(PatchParams.numVerts > 0)
+      GL.glPatchParameteri(eGL_PATCH_VERTICES, PatchParams.numVerts);
     if(!IsGLES)
     {
       GL.glPatchParameterfv(eGL_PATCH_DEFAULT_INNER_LEVEL, PatchParams.defaultInnerLevel);