The NYPD is refusing to reveal the costs of travel, lodging and related expenses for members of Mayor de Blasio’s security detail on his recent trip to Germany — and the lack of transparency has Hizzoner’s blessing.

Asked about the costs of his trip at an unrelated press conference Wednesday, the mayor initially said that the “NYPD always provides some kind of estimate — so please ask them for that.”

When reporters informed him that the NYPD was refusing to provide the figures, he immediately changed his tune and deferred to the force that he had hammered over its lack of transparency when he served as public advocate.

“When it’s security-related, I respect the protocols of the NYPD,” the mayor told reporters.