setControlCHook's parameter is not nil now

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/system.nim b/lib/system.nim
index 57d92b28e..69a77b89b 100644
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -2509,7 +2509,7 @@ when not defined(JS): #and not defined(NimrodVM):
     initGC()
 
   when not defined(NimrodVM):
-    proc setControlCHook*(hook: proc () {.noconv.})
+    proc setControlCHook*(hook: proc () {.noconv.} not nil)
       ## allows you to override the behaviour of your application when CTRL+C
       ## is pressed. Only one such hook is supported.