diff --git a/modules/wanikani-tmux.sh b/modules/wanikani-tmux.sh
index de74d03..8a9b09f 100755
--- a/modules/wanikani-tmux.sh
+++ b/modules/wanikani-tmux.sh
@@ -18,7 +18,7 @@ main()
 {
     get_wanikani
     # sleep for 30 minutes
-    sleep 1800m
+    sleep 1800
 }
 
 main
\ No newline at end of file