1 files changed, 1 insertions, 0 deletions

diff --git a/src/window.c b/src/window.c
index c806739fd0e..5c674909224 100644
--- a/src/window.c
+++ b/src/window.c
@@ -2072,6 +2072,7 @@ Returns the window displaying BUFFER.")
 #endif
           /* If window appears above or below another,
              even out their heights.  */
+          other = upper = lower = Qnil;
           if (!NILP (XWINDOW (window)->prev))
             other = upper = XWINDOW (window)->prev, lower = window;
           if (!NILP (XWINDOW (window)->next))