--- a/dom/canvas/WebGLTexture.cpp
+++ b/dom/canvas/WebGLTexture.cpp
@@ -1018,16 +1018,20 @@ WebGLTexture::TexParameter(TexTarget tex
     case LOCAL_GL_TEXTURE_WRAP_S:
         mWrapS = intParam;
         break;
 
     case LOCAL_GL_TEXTURE_WRAP_T:
         mWrapT = intParam;
         break;
 
+    case LOCAL_GL_TEXTURE_COMPARE_MODE:
+        mTexCompareMode = intParam;
+        break;
+
     // We don't actually need to store the WRAP_R, since it doesn't change texture
     // completeness rules.
     }
 
     // Only a couple of pnames don't need to invalidate our resolve status cache.
     switch (pname) {
     case LOCAL_GL_TEXTURE_MAX_ANISOTROPY_EXT:
     case LOCAL_GL_TEXTURE_WRAP_R: