diff --git a/gtk/gtkscale.c b/gtk/gtkscale.c
index 70369410bf..887af19200 100644
--- a/gtk/gtkscale.c
+++ b/gtk/gtkscale.c
@@ -1544,7 +1544,7 @@ weed_out_neg_zero (gchar *str,
       gchar neg_zero[8];
       g_snprintf (neg_zero, 8, "%0.*f", digits, -0.0);
       if (strcmp (neg_zero, str) == 0)
-        memmove (str, str + 1, strlen (str) - 1);
+        memmove (str, str + 1, strlen (str));
     }
   return str;
 }
diff --git a/gtk/gtkspinbutton.c b/gtk/gtkspinbutton.c
index e4ddfaecb6..e673bd3a03 100644
--- a/gtk/gtkspinbutton.c
+++ b/gtk/gtkspinbutton.c
@@ -1101,7 +1101,7 @@ weed_out_neg_zero (gchar *str,
       gchar neg_zero[8];
       g_snprintf (neg_zero, 8, "%0.*f", digits, -0.0);
       if (strcmp (neg_zero, str) == 0)
-        memmove (str, str + 1, strlen (str) - 1);
+        memmove (str, str + 1, strlen (str));
     }
   return str;
 }