--- a/content/canvas/src/WebGLContextGL.cpp
+++ b/content/canvas/src/WebGLContextGL.cpp
@@ -3817,17 +3817,17 @@ WebGLContext::TexSubImage2D_base(WebGLen
         = (height-1) * checked_alignedRowSize + checked_plainRowSize;
 
     if (!checked_neededByteLength.valid())
         return ErrorInvalidOperation("texSubImage2D: integer overflow computing the needed buffer size");
 
     PRUint32 bytesNeeded = checked_neededByteLength.value();
  
     if (byteLength < bytesNeeded)
-        return ErrorInvalidValue("texSubImage2D: not enough data for operation (need %d, have %d)", bytesNeeded, byteLength);
+        return ErrorInvalidOperation("texSubImage2D: not enough data for operation (need %d, have %d)", bytesNeeded, byteLength);
 
     WebGLTexture *tex = activeBoundTextureForTarget(target);
 
     if (!tex)
         return ErrorInvalidOperation("texSubImage2D: no texture is bound to this target");
 
     if (!CanvasUtils::CheckSaneSubrectSize(xoffset, yoffset, width, height, tex->width(), tex->height()))
         return ErrorInvalidValue("texSubImage2D: subtexture rectangle out of bounds");