diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c
index 947b2e7..189e413 100644
--- a/src/regexp_nfa.c
+++ b/src/regexp_nfa.c
@@ -2580,6 +2580,7 @@
 		nstate += n;
 		break;
 	    }
+	    s = NULL; /* avoid compiler warning */
 	    e1.out = NULL; /* stores list with out1's */
 	    s1 = NULL; /* previous NFA_SPLIT to connect to */
 	    while (n-- > 0)