diff --git a/src/libs/print/libprint/Halftone.cpp b/src/libs/print/libprint/Halftone.cpp
index 534e5530f4..82b5e6e0bd 100644
--- a/src/libs/print/libprint/Halftone.cpp
+++ b/src/libs/print/libprint/Halftone.cpp
@@ -167,7 +167,7 @@ Halftone::Dither(uchar* destination, const uchar* source, int x, int y,
 				break;
 		}
 	} else {
-		ASSERT(fGray == &gray);
+		ASSERT(fGray == &ToGray);
 	}
 
 	(this->*fDither)(destination, source, x, y, width);