diff --git a/source/arm11/cheat.c b/source/arm11/cheat.c
index b6a7562..e028620 100644
--- a/source/arm11/cheat.c
+++ b/source/arm11/cheat.c
@@ -352,7 +352,7 @@ static CodeLocation rom_fit_newsize( CodeLocation rom, int realend, int totalsiz
     else if( nextPow2(size) != nextPow2(szrom) )
     {
         // 似乎没什么要动的
-        *newsize = size + 1;    // reserve a word for padding
+        *newsize = size + INSTR_SIZE;    // reserve a word for padding
         return rom + INSTR_LEN( realend );
     }