diff --git a/utils/instantfpc/fpmake.pp b/utils/instantfpc/fpmake.pp
index 9d85bb3c86..7d2019321e 100644
--- a/utils/instantfpc/fpmake.pp
+++ b/utils/instantfpc/fpmake.pp
@@ -2,7 +2,11 @@
 {$mode objfpc}{$H+}
 program fpmake;
 
-uses fpmkunit;
+uses 
+  {$ifdef unix}
+  cthreads,
+  {$endif}
+  fpmkunit;
 {$endif ALLPACKAGES}
 
 procedure add_instantfpc(const ADirectory: string);