diff --git a/src/regexp_nfa.c b/src/regexp_nfa.c
index 47d7030..fc87e39 100644
--- a/src/regexp_nfa.c
+++ b/src/regexp_nfa.c
@@ -273,6 +273,7 @@
 static int nfa_get_reganch __ARGS((nfa_state_T *start, int depth));
 static int nfa_get_regstart __ARGS((nfa_state_T *start, int depth));
 static char_u *nfa_get_match_text __ARGS((nfa_state_T *start));
+static int realloc_post_list __ARGS((void));
 static int nfa_recognize_char_class __ARGS((char_u *start, char_u *end, int extra_newl));
 static int nfa_emit_equi_class __ARGS((int c));
 static int nfa_regatom __ARGS((void));