diff --git a/modman/main.py b/modman/main.py
index 772fe93..236e51c 100755
--- a/modman/main.py
+++ b/modman/main.py
@@ -10,14 +10,29 @@ folder = "scripts"
 mm = ModuleManager(folder)
 mods = mm.modules
 
-while True:
-    mm.update()
-    with ThreadPoolExecutor() as ex:
-        for f in mods.values():
+
+futs = {}
+
+with ThreadPoolExecutor() as ex:
+    while True:
+        mm.update()
+
+        for n, fut in tuple(futs.items()):
+            if fut.done():
+                del futs[n]
+
+        print("not done:", futs)
+
+        for n, f in mods.items():
+            if n in futs:
+                print(f"{n} still running... will not start again")
+                continue
+
             fut = ex.submit(f)
             print(fut)
+            futs[n] = fut
 
-    sleep(1)
+        sleep(1)