1 files changed, 3 insertions, 1 deletions
diff --git a/regcomp.h b/regcomp.h
index 1ef9d2daee..362a8ed0bd 100644
--- a/regcomp.h
+++ b/regcomp.h
@@ -767,9 +767,11 @@ re.pm, especially to the documentation.
     if (re_debug_flags & RE_DEBUG_EXTRA_GPOS) x )
 
 /* initialization */
-/* get_sv() can return NULL during global destruction. */
+/* get_sv() can return NULL during global destruction.  re_debug_flags can get
+ * clobbered by a longjmp, so must be initialized */
 #define GET_RE_DEBUG_FLAGS DEBUG_r({ \
         SV * re_debug_flags_sv = NULL; \
+        re_debug_flags = 0;            \
         re_debug_flags_sv = get_sv(RE_DEBUG_FLAGS, 1); \
         if (re_debug_flags_sv) { \
             if (!SvIOK(re_debug_flags_sv)) \