diff --git a/kernel/ps4_kernel_file.pas b/kernel/ps4_kernel_file.pas
index 38e40906..b9d4dd4c 100644
--- a/kernel/ps4_kernel_file.pas
+++ b/kernel/ps4_kernel_file.pas
@@ -66,6 +66,9 @@ function ps4_ioctl(fd,cmd:Integer;param1:ptruint):Integer; SysV_ABI_CDecl;
 function ps4_stat(path:PChar;stat:PSceKernelStat):Integer; SysV_ABI_CDecl;
 function ps4_sceKernelStat(path:PChar;stat:PSceKernelStat):Integer; SysV_ABI_CDecl;
 
+function ps4_truncate(path:PChar;length:Int64):Integer; SysV_ABI_CDecl;
+function ps4_sceKernelTruncate(path:PChar;length:Int64):Integer; SysV_ABI_CDecl;
+
 function ps4_mkdir(path:PChar;mode:Integer):Integer; SysV_ABI_CDecl;
 function ps4_sceKernelMkdir(path:PChar;mode:Integer):Integer; SysV_ABI_CDecl;
 
@@ -651,6 +654,65 @@ begin
  Result:=px2sce(Result);
 end;
 
+function _sys_truncate(path:PChar;length:Int64):Integer;
+var
+ fn:RawByteString;
+begin
+ Result:=0;
+
+ if (path=nil) then Exit(EINVAL);
+ if (length<=0) then Exit(EINVAL);
+
+ if (path[0]=#0) then
+ begin
+  Exit(ENOENT);
+ end;
+
+ Writeln(SysLogPrefix,'truncate:',path,' ',length);
+
+ fn:='';
+ Result:=parse_filename(path,fn);
+
+ Case Result of
+  PT_ROOT:Exit(EACCES); //TODO
+  PT_FILE:;
+  PT_DEV :Exit(EACCES);
+  else
+          Exit(EACCES);
+ end;
+
+ if FileExists(fn) then
+ begin
+  Result:=_sys_file_trunc(fn,length);
+ end else
+ begin
+  if DirectoryExists(fn) then
+  begin
+   Result:=EISDIR;
+  end else
+  begin
+   Result:=ENOENT;
+  end;
+ end;
+end;
+
+function ps4_truncate(path:PChar;length:Int64):Integer; SysV_ABI_CDecl;
+begin
+ _sig_lock;
+ Result:=_set_errno(_sys_truncate(path,length));
+ _sig_unlock;
+end;
+
+function ps4_sceKernelTruncate(path:PChar;length:Int64):Integer; SysV_ABI_CDecl;
+begin
+ _sig_lock;
+ Result:=_sys_truncate(path,length);
+ _sig_unlock;
+
+ _set_errno(Result);
+ Result:=px2sce(Result);
+end;
+
 function _sys_mkdir(path:PChar;mode:Integer):Integer;
 var
  fn:RawByteString;
diff --git a/kernel/ps4_libkernel.pas b/kernel/ps4_libkernel.pas
index 9b3c3f1c..3a66dc2c 100644
--- a/kernel/ps4_libkernel.pas
+++ b/kernel/ps4_libkernel.pas
@@ -1718,6 +1718,9 @@ begin
  lib^.set_proc($13A6A8DF8C0FC3E5,@ps4_stat);
  lib^.set_proc($795F70003DAB8880,@ps4_sceKernelStat);
 
+ lib^.set_proc($6B2AEDB3323B1818,@ps4_truncate);
+ lib^.set_proc($5A5C8403FB0B0DFD,@ps4_sceKernelTruncate);
+
  lib^.set_proc($246322A3EDB52F87,@ps4_mkdir);
  lib^.set_proc($D7F2C52E6445C713,@ps4_sceKernelMkdir);
 
diff --git a/sys/sys_file.pas b/sys/sys_file.pas
index 08bd8de4..5ba732b5 100644
--- a/sys/sys_file.pas
+++ b/sys/sys_file.pas
@@ -16,6 +16,7 @@ uses
 
 function _sys_file_open(const path:RawByteString;flags,mode:Integer):Integer;
 function _sys_file_stat(Const path:RawByteString;stat:PSceKernelStat):Integer;
+function _sys_file_trunc(Const path:RawByteString;length:Int64):Integer;
 
 implementation
 
@@ -169,13 +170,26 @@ var
 begin
  f:=nil;
  Result:=__sys_file_open(path,O_RDONLY,0,f);
- if (Result<>0) then Exit(-Result);
+ if (Result<>0) then Exit;
 
  Result:=f.fstat(stat);
 
  f.Destroy;
 end;
 
+function _sys_file_trunc(Const path:RawByteString;length:Int64):Integer;
+var
+ f:TFile;
+begin
+ f:=nil;
+ Result:=__sys_file_open(path,O_RDWR,0,f);
+ if (Result<>0) then Exit;
+
+ Result:=f.ftruncate(length);
+
+ f.Destroy;
+end;
+
 //
 
 Constructor TFile.Create;