We use a generalization of Wiener's 1/f theorem to prove that for a Gabor frame with the generator in the Wiener amalgam space W (L , 1 )(Rd ), the corresponding frame operator is invertible on this space. Therefore, for such a Gabor frame, the generator of the canonical dual belongs also to W (L , 1 )(Rd ). 							
						
							
					 															
					Ilya A. Krishtal, Kasso A. Okoudjou