diff --git a/kernel/trunk/const.inc b/kernel/trunk/const.inc
index fd3cb6c747..58d3ca7157 100644
--- a/kernel/trunk/const.inc
+++ b/kernel/trunk/const.inc
@@ -520,7 +520,7 @@ struct  APPDATA
                         dw ?            ;+126
         wnd_shape       dd ?            ;+128
         wnd_shape_scale dd ?            ;+132
-        mem_start       dd ?            ;+136
+                        dd ?            ;+136
         counter_sum     dd ?            ;+140  ; R
         saved_box       BOX             ;+144
         ipc_start       dd ?            ;+160
diff --git a/kernel/trunk/core/taskman.inc b/kernel/trunk/core/taskman.inc
index fa61ca1077..431e5bfd28 100644
--- a/kernel/trunk/core/taskman.inc
+++ b/kernel/trunk/core/taskman.inc
@@ -972,7 +972,6 @@ proc set_app_params stdcall,slot:dword, params:dword, flags:dword
         mov     [ebx+SLOT_BASE+APPDATA.cur_dir], eax
         rep movsd
 
-        mov     dword [ebx+SLOT_BASE+APPDATA.mem_start], 0
         mov     [ebx+SLOT_BASE+APPDATA.event_mask], dword 1+2+4;set default event flags (see 40 function)
         inc     dword [process_number]
         mov     eax, [process_number]
diff --git a/kernel/trunk/kernel.asm b/kernel/trunk/kernel.asm
index d4f0d5bee7..2ce456e1b7 100644
--- a/kernel/trunk/kernel.asm
+++ b/kernel/trunk/kernel.asm
@@ -1607,9 +1607,7 @@ sys_setup:
         dec     ebx
         jnz     @f
 
-        mov     edi, [current_slot]
-        mov     eax, [edi+APPDATA.mem_start]
-        add     eax, edx
+        mov     eax, edx
 ; 1 = normal layout
         dec     ecx
         jnz     .shift
@@ -1704,16 +1702,13 @@ sys_getsetup:
         dec     ebx
         jnz     @f
 
-        mov     edi, [current_slot]
-        mov     ebx, [edi+APPDATA.mem_start]
-        add     ebx, edx
-; 1 = normal layout
-        dec     ecx
-        jnz     .shift
-
+        mov     ebx, edx
         ; if given memory address belongs to kernel then error
         stdcall is_region_userspace, ebx, 128
         jnz     .addr_error
+; 1 = normal layout
+        dec     ecx
+        jnz     .shift
 
         mov     eax, keymap
         mov     ecx, 128
@@ -1725,9 +1720,6 @@ sys_getsetup:
         dec     ecx
         jnz     .alt
 
-        stdcall is_region_userspace, ebx, 128
-        jnz     .addr_error
-
         mov     eax, keymap_shift
         mov     ecx, 128
         call    memmove
@@ -1738,9 +1730,6 @@ sys_getsetup:
         dec     ecx
         jne     .country
 
-        stdcall is_region_userspace, ebx, 128
-        jnz     .addr_error
-
         mov     eax, keymap_alt
         mov     ecx, 128
         call    memmove