diff --git a/lib/png/utils/scale.js b/lib/png/utils/scale.js
index 6df3d46..1a0cb93 100644
--- a/lib/png/utils/scale.js
+++ b/lib/png/utils/scale.js
@@ -145,7 +145,7 @@ scale.scaleUp = function (input, output, spreadFn, isColor, hasAlphaChannel, isI
 
 		spreadFn(value, bytes);
 
-		while (bytes.length > bytesNeeded) {
+		while (bytes.length >= bytesNeeded) {
 			this[method](output, bytes.splice(0, bytesNeeded));
 		}
 	}