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-rw-r--r--ext/tk/lib/tk/timer.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/timer.rb b/ext/tk/lib/tk/timer.rb
index aa2272f9bb..87670c962f 100644
--- a/ext/tk/lib/tk/timer.rb
+++ b/ext/tk/lib/tk/timer.rb
@@ -353,6 +353,7 @@ class TkTimer
Tk_CBTBL[@id] = self
@do_loop = @loop_exec
@current_pos = 0
+ @return_value = nil
@after_id = nil
@init_sleep = 0