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-rw-r--r--src/variable.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/variable.c b/src/variable.c
index 87e468dc2..bd598dd37 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -19,7 +19,7 @@ typedef struct iv_tbl {
} iv_tbl;
#define IV_EMPTY 0
-#define IV_DELETED (1<<31)
+#define IV_DELETED (1UL<<31)
#define IV_KEY_P(k) (((k)&~((uint32_t)IV_DELETED))!=0)
/* Creates the instance variable table. */