diff --git a/src/Deflate.c b/src/Deflate.c
index 1f696acc1..9cd0f6dee 100644
--- a/src/Deflate.c
+++ b/src/Deflate.c
@@ -44,7 +44,7 @@ cc_result GZipHeader_Read(struct Stream* s, struct GZipHeader* header) {
 		header->State++;
 
 	case GZIP_STATE_FLAGS:
-		Header_ReadU8(tmp);
+		Header_ReadU8(header->Flags);
 		if (header->Flags & 0x04) return GZIP_ERR_FLAGS;
 		header->State++;