1 files changed, 2 insertions, 0 deletions
diff --git a/sv.c b/sv.c
index 0a4a2e531a..d7315b2a3f 100644
--- a/sv.c
+++ b/sv.c
@@ -15896,6 +15896,8 @@ Perl_clone_params_new(PerlInterpreter *const from, PerlInterpreter *const to)
 void
 Perl_init_constants(pTHX)
 {
+    dVAR;
+
     SvREFCNT(&PL_sv_undef)	= SvREFCNT_IMMORTAL;
     SvFLAGS(&PL_sv_undef)	= SVf_READONLY|SVf_PROTECT|SVt_NULL;
     SvANY(&PL_sv_undef)		= NULL;