1 files changed, 3 insertions, 2 deletions
diff --git a/hv.c b/hv.c
index 627140bf2a..ca945f646d 100644
--- a/hv.c
+++ b/hv.c
@@ -2016,9 +2016,10 @@ S_unshare_hek_or_pvn(pTHX_ HEK *hek, const char *str, I32 len, U32 hash)
     UNLOCK_STRTAB_MUTEX;
     if (!found && ckWARN_d(WARN_INTERNAL))
 	Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
-                    "Attempt to free non-existent shared string '%s'%s",
+                    "Attempt to free non-existent shared string '%s'%s"
+                    pTHX__FORMAT,
                     hek ? HEK_KEY(hek) : str,
-                    (k_flags & HVhek_UTF8) ? " (utf8)" : "");
+                    ((k_flags & HVhek_UTF8) ? " (utf8)" : "") pTHX__VALUE);
     if (k_flags & HVhek_FREEKEY)
 	Safefree(str);
 }