1 files changed, 5 insertions, 1 deletions

diff --git a/mro.c b/mro.c
index fe776474d4..23f8c078c8 100644
--- a/mro.c
+++ b/mro.c
@@ -438,7 +438,7 @@ Perl_mro_isa_changed_in(pTHX_ HV* stash)
     if(meta->mro_nextmethod) hv_clear(meta->mro_nextmethod);
 
     /* Iterate the isarev (classes that are our children),
-       wiping out their linearization and method caches */
+       wiping out their linearization, method and isa caches */
     if(isarev) {
         hv_iterinit(isarev);
         while((iter = hv_iternext(isarev))) {
@@ -463,6 +463,10 @@ Perl_mro_isa_changed_in(pTHX_ HV* stash)
                 revmeta->cache_gen++;
             if(revmeta->mro_nextmethod)
                 hv_clear(revmeta->mro_nextmethod);
+	    if (revmeta->isa) {
+		SvREFCNT_dec(revmeta->isa);
+		revmeta->isa = NULL;
+	    }
         }
     }