diff --git a/sed.c b/sed.c
index 6b10eb6..6982c40 100644
--- a/sed.c
+++ b/sed.c
@@ -1428,7 +1428,7 @@ cmd_s(Cmd *c)
 	lastre = re;
 
 	plen = re->re_nsub + 1;
-	pmatch = emalloc(plen * sizeof(regmatch_t));
+	pmatch = ereallocarray(NULL, plen, sizeof(regmatch_t));
 
 	*genbuf.str = '\0';
 	s = patt.str;