diff --git a/src/kits/interface/Bitmap.cpp b/src/kits/interface/Bitmap.cpp
index 973663b765..1fd6d18401 100644
--- a/src/kits/interface/Bitmap.cpp
+++ b/src/kits/interface/Bitmap.cpp
@@ -207,7 +207,7 @@ BBitmap::BBitmap(const BBitmap *source, bool acceptsViews,
 		_InitObject(source->Bounds(), source->ColorSpace(), flags,
 				   source->BytesPerRow(), B_MAIN_SCREEN_ID);
 		if (InitCheck() == B_OK)
-			memcpy(Bits(), source->Bits(), BytesPerRow());
+			memcpy(Bits(), source->Bits(), BitsLength());
 	}
 }