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-rw-r--r--byterun/intern.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/byterun/intern.c b/byterun/intern.c
index 5f99b5b063..b7acfd4a06 100644
--- a/byterun/intern.c
+++ b/byterun/intern.c
@@ -76,7 +76,7 @@ static value intern_block;
(Sign_extend(intern_src[-2]) << 8) + intern_src[-1])
#define read32u() \
(intern_src += 4, \
- (intern_src[-4] << 24) + (intern_src[-3] << 16) + \
+ ((uintnat)(intern_src[-4]) << 24) + (intern_src[-3] << 16) + \
(intern_src[-2] << 8) + intern_src[-1])
#define read32s() \
(intern_src += 4, \