diff --git a/src/cmd/compile/internal/ssa/regalloc.go b/src/cmd/compile/internal/ssa/regalloc.go
index 2e121df3cc..c7cdea261d 100644
--- a/src/cmd/compile/internal/ssa/regalloc.go
+++ b/src/cmd/compile/internal/ssa/regalloc.go
@@ -1688,7 +1688,7 @@ func (s *regAllocState) regalloc(f *Func) {
 						}
 					}
 					// Avoid registers we're saving for other values.
-					if mask&^desired.avoid&^s.nospill != 0 {
+					if mask&^desired.avoid&^s.nospill&^s.used != 0 {
 						mask &^= desired.avoid
 					}
 					r := s.allocReg(mask, v)