diff --git a/data/mods/My_Sweet_Cataclysm/sweet_effect.json b/data/mods/My_Sweet_Cataclysm/sweet_effect.json
index ab39f8d579a2b..416caf3b97bf7 100644
--- a/data/mods/My_Sweet_Cataclysm/sweet_effect.json
+++ b/data/mods/My_Sweet_Cataclysm/sweet_effect.json
@@ -8,6 +8,7 @@
     "rating": "bad",
     "miss_messages": [ [ "The gum webs constrict your movement.", 4 ] ],
     "max_intensity": 3,
+    "max_duration": "30 s",
     "base_mods": { "speed_mod": [ -20 ] },
     "scaling_mods": { "speed_mod": [ -20 ] },
     "show_in_info": true