sign fix
diff --git a/include/fcall.h b/include/fcall.h
index 6f46487..dc46cb5 100644
--- a/include/fcall.h
+++ b/include/fcall.h
@@ -50,7 +50,7 @@
#define GBIT8(p) ((p)[0])
#define GBIT16(p) ((p)[0]|((p)[1]<<8))
#define GBIT32(p) ((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24))
-#define GBIT64(p) ((vlong)((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24)) |\
+#define GBIT64(p) ((u32int)((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24)) |\
((vlong)((p)[4]|((p)[5]<<8)|((p)[6]<<16)|((p)[7]<<24)) << 32))
#define PBIT8(p,v) (p)[0]=(v)
