diff --git a/gcc/common.opt b/gcc/common.opt
index 51c4a17da83..1ad0169bd6f 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2295,7 +2295,7 @@ Common Var(flag_move_loop_stores) Optimization
 Move stores out of loops.
 
 fmultiflags
-Common Driver
+Common Driver RejectNegative
 Building block for specs-based multilib-aware TFLAGS.
 
 fdce