diff --git a/Control/Concurrent.hs b/Control/Concurrent.hs
index 55861fc7e47465e3716ca075aa4de48562b76cee..8f350693bf7a562ffd2b8d583aed1dc7a3f1343c 100644
--- a/Control/Concurrent.hs
+++ b/Control/Concurrent.hs
@@ -45,7 +45,6 @@ module Control.Concurrent (
         forkOn,
         forkOnWithUnmask,
         getNumCapabilities,
-        setNumCapabilities,
         threadCapability,
 
         -- * Scheduling