1 files changed, 1 insertions, 1 deletions

diff --git a/lib/ucs2_string.c b/lib/ucs2_string.c
index f0b323abb4c6..ae8d2491133c 100644
--- a/lib/ucs2_string.c
+++ b/lib/ucs2_string.c
@@ -56,7 +56,7 @@ ucs2_utf8size(const ucs2_char_t *src)
         unsigned long i;
         unsigned long j = 0;
 
-        for (i = 0; i < ucs2_strlen(src); i++) {
+        for (i = 0; src[i]; i++) {
                 u16 c = src[i];
 
                 if (c >= 0x800)