diff --git a/rtl/unix/cthreads.pp b/rtl/unix/cthreads.pp
index e56f241b42..9db8e26881 100644
--- a/rtl/unix/cthreads.pp
+++ b/rtl/unix/cthreads.pp
@@ -36,8 +36,7 @@ implementation
 Uses
   BaseUnix,
   unix,
-  unixtype,
-  sysutils
+  unixtype
 {$ifdef dynpthreads}
   ,dl
 {$endif}