diff --git a/ip/link_gre6.c b/ip/link_gre6.c
index a3e8e088..7ae4b492 100644
--- a/ip/link_gre6.c
+++ b/ip/link_gre6.c
@@ -251,12 +251,12 @@ get_failed:
 			__u8 uval;
 
 			NEXT_ARG();
+			flowinfo &= ~IP6_FLOWINFO_TCLASS;
 			if (strcmp(*argv, "inherit") == 0)
 				flags |= IP6_TNL_F_USE_ORIG_TCLASS;
 			else {
 				if (get_u8(&uval, *argv, 16))
 					invarg("invalid TClass", *argv);
-				flowinfo &= ~IP6_FLOWINFO_TCLASS;
 				flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
 				flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
 			}
@@ -265,6 +265,7 @@ get_failed:
 			__u32 uval;
 
 			NEXT_ARG();
+			flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
 			if (strcmp(*argv, "inherit") == 0)
 				flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
 			else {
@@ -272,7 +273,6 @@ get_failed:
 					invarg("invalid Flowlabel", *argv);
 				if (uval > 0xFFFFF)
 					invarg("invalid Flowlabel", *argv);
-				flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
 				flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
 				flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
 			}