diff --git a/api/s6_pumps.py b/api/s6_pumps.py
index 1f9dce8..1bdbef9 100644
--- a/api/s6_pumps.py
+++ b/api/s6_pumps.py
@@ -175,9 +175,12 @@ def inp_out_pump(name: str) -> list[str]:
 def unset_pump_by_curve(name: str, curve: str) -> ChangeSet:
     cs = ChangeSet()
 
-    rows = read_all(name, f"select id from pumps where head = '{curve}'")
+    rows = read_all(name, f"select * from pumps where head = '{curve}'")
     for row in rows:
-        cs.append(g_update_prefix | {'type': 'pump', 'id': row['id'], 'head': None})
+        if row['power'] != None:
+            cs.append(g_update_prefix | {'type': 'pump', 'id': row['id'], 'head': None})
+        else: # workaround to prevent pump deletion... and I don't want to remove constraint...
+            cs.append(g_update_prefix | {'type': 'pump', 'id': row['id'], 'head': None, 'power': 0.0})
 
     return cs