diff --git a/regex/compile.go b/regex/compile.go
index a28d114..82a35d9 100644
--- a/regex/compile.go
+++ b/regex/compile.go
@@ -989,7 +989,7 @@ func thompson(re []postfixNode) (Reg, error) {
 				return &s
 			})
 			// Reduce the list of states down to a single state by alternating them
-			toAdd := Reduce(states, func(s1 *State, s2 *State) *State {
+			toAdd := funcReduce(states, func(s1 *State, s2 *State) *State {
 				return alternate(s1, s2)
 			})
 			nfa = append(nfa, toAdd)