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-rw-r--r--warnings.pl4
1 files changed, 2 insertions, 2 deletions
diff --git a/warnings.pl b/warnings.pl
index e3c0403669..9967175635 100644
--- a/warnings.pl
+++ b/warnings.pl
@@ -325,8 +325,8 @@ print WARN <<'EOM';
#define isLEXWARN_on (PL_curcop->cop_warnings != pWARN_STD)
#define isLEXWARN_off (PL_curcop->cop_warnings == pWARN_STD)
#define isWARN_ONCE (PL_dowarn & (G_WARN_ON|G_WARN_ONCE))
-#define isWARN_on(c,x) (IsSet(SvPVX(c), 2*(x)))
-#define isWARNf_on(c,x) (IsSet(SvPVX(c), 2*(x)+1))
+#define isWARN_on(c,x) (IsSet(SvPVX_const(c), 2*(x)))
+#define isWARNf_on(c,x) (IsSet(SvPVX_const(c), 2*(x)+1))
#define ckWARN(x) \
( (isLEXWARN_on && PL_curcop->cop_warnings != pWARN_NONE && \