1 files changed, 2 insertions, 0 deletions
diff --git a/regexec.c b/regexec.c
index 9b6232e30b..10ada4d81d 100644
--- a/regexec.c
+++ b/regexec.c
@@ -323,7 +323,9 @@ onig_region_init(OnigRegion* region)
   region->allocated    = 0;
   region->beg          = (OnigPosition* )0;
   region->end          = (OnigPosition* )0;
+#ifdef USE_CAPTURE_HISTORY
   region->history_root = (OnigCaptureTreeNode* )0;
+#endif
 }
 
 extern OnigRegion*