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-rw-r--r--src/string.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/string.c b/src/string.c
index fa581f025..90852943e 100644
--- a/src/string.c
+++ b/src/string.c
@@ -1500,7 +1500,7 @@ mrb_ptr_to_str(mrb_state *mrb, void *p)
struct RString *p_str;
char *p1;
char *p2;
- intptr_t n = (intptr_t)p;
+ uintptr_t n = (uintptr_t)p;
p_str = str_new(mrb, NULL, 2 + sizeof(uintptr_t) * CHAR_BIT / 4);
p1 = p_str->ptr;