1 files changed, 1 insertions, 1 deletions

diff --git a/src/frame.c b/src/frame.c
index 74588cea702..4089ec94b9e 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -4001,7 +4001,7 @@ x_set_alpha (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
       else if (INTEGERP (item))
         {
           EMACS_INT ialpha = XINT (item);
-          if (! (0 <= ialpha && alpha <= 100))
+          if (! (0 <= ialpha && ialpha <= 100))
             args_out_of_range (make_number (0), make_number (100));
           alpha = ialpha / 100.0;
         }