Cheese is gumming up a major trade deal between Mexico and the European Union.

Technically it’s two cheeses: Manchego from Spain and Manchego from Mexico.

Spanish Manchego is a hard, aged cheese made from sheep’s milk in the La Mancha region. It was given Protected Designation of Origin status by the EU and protected status in Spain.

In Mexico, Manchego is used more generically to describe a soft cheese that’s often used for melting in foods such as quesadillas.

The Spanish Brotherhood of the Manchego Cheese told The Guardian that the Mexican stuff is “an insipid cow’s milk cheese that sometimes doesn’t even look like a cheese.”

But what’s the issue with the name? The Spanish cheesemakers want to use the “Manchego” exclusively, arguing the cheaper Mexican Manchego is taking a big bite out of their sales.

Cheesemakers in Mexico believe buyers know the difference.

How bad is the cheese standoff? In December, the Mexican economy minister visited Brussels to try to work out revisions to the trade agreement, but no deal was made.