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-rw-r--r--teensy/std.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/teensy/std.h b/teensy/std.h
index 7003e7be0b..42791877a3 100644
--- a/teensy/std.h
+++ b/teensy/std.h
@@ -10,7 +10,7 @@ void *memcpy(void *dest, const void *src, size_t n);
void *memmove(void *dest, const void *src, size_t n);
void *memset(void *s, int c, size_t n);
-int strlen(const char *str);
+size_t strlen(const char *str);
int strcmp(const char *s1, const char *s2);
int strncmp(const char *s1, const char *s2, size_t n);
char *strcpy(char *dest, const char *src);