1 files changed, 4 insertions, 0 deletions
diff --git a/mro.c b/mro.c
index da30c4df7b..4d7ade5747 100644
--- a/mro.c
+++ b/mro.c
@@ -546,6 +546,10 @@ Perl_mro_isa_changed_in(pTHX_ HV* stash)
     SvREFCNT_dec((SV*)meta->mro_linear_c3);
     meta->mro_linear_dfs = NULL;
     meta->mro_linear_c3 = NULL;
+    if (meta->isa) {
+	SvREFCNT_dec(meta->isa);
+	meta->isa = NULL;
+    }
 
     /* Inc the package generation, since our @ISA changed */
     meta->pkg_gen++;