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-rw-r--r--include/rtthread.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/rtthread.h b/include/rtthread.h
index cee58e402b..83be7d1ebc 100644
--- a/include/rtthread.h
+++ b/include/rtthread.h
@@ -596,7 +596,7 @@ rt_size_t rt_strnlen(const char *s, rt_ubase_t maxlen);
#ifdef __ARMCC_VERSION
/* MDK doesn't have these APIs */
char* strdup(const char* str);
-size_t strnlen(const char *s, size_t maxlen);
+rt_size_t strnlen(const char *s, rt_size_t maxlen);
#endif /* __ARMCC_VERSION */
void rt_show_version(void);