1 files changed, 3 insertions, 4 deletions
diff --git a/pp_ctl.c b/pp_ctl.c
index f6934e9f3b..db626a1c98 100644
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -86,11 +86,10 @@ PP(pp_regcomp) {
     else {
 	t = SvPV(tmpstr, len);
 
-	/* JMR: Check against the last compiled regexp
-	   To know for sure, we'd need the length of precomp.
-	   But we don't have it, so we must ... take a guess. */
+	/* Check against the last compiled regexp. */
 	if (!pm->op_pmregexp || !pm->op_pmregexp->precomp ||
-	    memNE(pm->op_pmregexp->precomp, t, len + 1))
+	    pm->op_pmregexp->prelen != len ||
+	    memNE(pm->op_pmregexp->precomp, t, len))
 	{
 	    if (pm->op_pmregexp) {
 		ReREFCNT_dec(pm->op_pmregexp);