1 files changed, 5 insertions, 3 deletions

diff --git a/libbb/unicode.c b/libbb/unicode.c
index 844c154e0..39b173e9c 100644
--- a/libbb/unicode.c
+++ b/libbb/unicode.c
@@ -203,11 +203,13 @@ size_t FAST_FUNC mbstowcs(wchar_t *dest, const char *src, size_t n)
 
         while (n) {
                 wchar_t wc;
-                const char *rc = mbstowc_internal(dest ? dest : &wc, src);
-                if (rc == NULL) /* error */
+                src = mbstowc_internal(&wc, src);
+                if (src == NULL) /* error */
                         return (size_t) -1L;
                 if (dest)
-                        dest++;
+                        *dest++ = wc;
+                if (wc == 0) /* end-of-string */
+                        break;
                 n--;
         }