1 files changed, 1 insertions, 1 deletions

diff --git a/coreutils/expr.c b/coreutils/expr.c
index 191473446..51e553dc6 100644
--- a/coreutils/expr.c
+++ b/coreutils/expr.c
@@ -136,7 +136,7 @@ static int null(VALUE * v)
         if (v->type == integer)
                 return v->u.i == 0;
         else                            /* string: */
-                return v->u.s[0] == '\0' || strcmp(v->u.s, "0") == 0;
+                return v->u.s[0] == '\0' || LONE_CHAR(v->u.s, '0');
 }
 
 /* Coerce V to a string value (can't fail).  */