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-rw-r--r--src/backend/regex/regcomp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/regex/regcomp.c b/src/backend/regex/regcomp.c
index 44a472fa69e..5f1e3c5a1a6 100644
--- a/src/backend/regex/regcomp.c
+++ b/src/backend/regex/regcomp.c
@@ -228,7 +228,7 @@ struct vars
struct subre *tree; /* subexpression tree */
struct subre *treechain; /* all tree nodes allocated */
struct subre *treefree; /* any free tree nodes */
- int ntree; /* number of tree nodes */
+ int ntree; /* number of tree nodes, plus one */
struct cvec *cv; /* interface cvec */
struct cvec *cv2; /* utility cvec */
struct subre *lacons; /* lookahead-constraint vector */