1 files changed, 2 insertions, 1 deletions
diff --git a/sv.c b/sv.c
index 44b9122a36..51dffcb9e5 100644
--- a/sv.c
+++ b/sv.c
@@ -1320,7 +1320,8 @@ Perl_sv_upgrade(pTHX_ register SV *sv, svtype new_type)
 	 * NV slot, but the new one does, then we need to initialise the
 	 * freshly created NV slot with whatever the correct bit pattern is
 	 * for 0.0  */
-	if (old_type_details->zero_nv && !new_type_details->zero_nv)
+	if (old_type_details->zero_nv && !new_type_details->zero_nv
+	    && !isGV_with_GP(sv))
 	    SvNV_set(sv, 0);
 #endif