diff --git a/programs/develop/fasm/trunk/fasm.asm b/programs/develop/fasm/trunk/fasm.asm
index 63cb56a12d..7cae1f64de 100644
--- a/programs/develop/fasm/trunk/fasm.asm
+++ b/programs/develop/fasm/trunk/fasm.asm
@@ -338,8 +338,29 @@ fun_opn_dlg: ;
 		push dword edit1
 		call dword [edit_box_set_text]
 
+		push dword [OpenDialog_data.filename_area]
+		push dword edit2
+		call dword [edit_box_set_text]
+
+		mov esi,[edit2.text]
+		xor eax,eax
+		cld
+		.cycle:
+			lodsb
+			test eax,eax
+			jnz .cycle
+		sub esi,4
+		cmp esi,[edit2.text]
+		jle .short_fn
+			mov byte[esi],0
+			sub dword [edit2.size],4
+			sub dword [edit2.pos],4
+		.short_fn:
+
 		push dword edit1
 		call dword [edit_box_draw]
+		push dword edit2
+		call dword [edit_box_draw]
 		push dword edit3
 		call dword [edit_box_draw]
 	@@: