diff --git a/ide/lazarus.pp b/ide/lazarus.pp
index f58371c71c..e8790476d8 100644
--- a/ide/lazarus.pp
+++ b/ide/lazarus.pp
@@ -44,6 +44,9 @@ program Lazarus;
 
 uses
   //cmem,
+  {$IFDEF UNIX}{$IFDEF UseCThreads}
+  cthreads,
+  {$ENDIF}{$ENDIF}
   {$IFDEF IDE_MEM_CHECK}
   MemCheck,
   {$ENDIF}
diff --git a/ide/project.pp b/ide/project.pp
index 52b7cd7c07..0d728204bb 100644
--- a/ide/project.pp
+++ b/ide/project.pp
@@ -4072,6 +4072,9 @@ begin
     +'{$mode objfpc}{$H+}'+le
     +le
     +'uses'+le
+    +'  {$IFDEF UNIX}{$IFDEF UseCThreads}'+le
+    +'  cthreads,'+le
+    +'  {$ENDIF}{$ENDIF}'+le
     +'  Classes'+le
     +'  { add your units here };'+le
     +le
@@ -4127,6 +4130,9 @@ begin
     +'{$mode objfpc}{$H+}'+le
     +le
     +'uses'+le
+    +'  {$IFDEF UNIX}{$IFDEF UseCThreads}'+le
+    +'  cthreads,'+le
+    +'  {$ENDIF}{$ENDIF}'+le
     +'  Interfaces, // this includes the LCL widgetset'+le
     +'  Forms'+le
     +'  { add your units here };'+le