diff --git a/libplum.nimble b/libplum.nimble
index b749ede..c1eb7de 100644
--- a/libplum.nimble
+++ b/libplum.nimble
@@ -6,6 +6,7 @@ author        = "Status Research & Development GmbH"
 description   = "Nim binding for libplum (PCP, NAT-PMP, UPnP-IGD port mapping)"
 license       = "Apache License 2.0 or MIT"
 installDirs   = @["libplum", "vendor"]
+installFiles  = @["libplum_units.c"]
 
 ### Dependencies
 requires "nim >= 1.6.0",
diff --git a/libplum/plum.nim b/libplum/plum.nim
index 2abc1b5..8b04450 100644
--- a/libplum/plum.nim
+++ b/libplum/plum.nim
@@ -243,10 +243,10 @@ proc createMapping*(
   try:
     # Wait for the signal's single fire (in mappingCallback)
     completed = await withTimeout(signal.wait(), timeout)
-  except CancelledError:
+  except CancelledError as e:
     # The signal was cancelled so it is safe to destroy and reclaim.
     await destroyAndReclaim(id, signal)
-    raise
+    raise e
 
   if not completed:
     # The signal was not fired so it is safe to destroy and reclaim.