diff --git a/source/arm11/open_agb_firm.c b/source/arm11/open_agb_firm.c
index 90aa498..7b2633c 100644
--- a/source/arm11/open_agb_firm.c
+++ b/source/arm11/open_agb_firm.c
@@ -814,7 +814,7 @@ static Result showFileBrowser(char romAndSavePath[512])
 				{
 					strncpy(lastDir, romAndSavePath, cmpLen);
 					lastDir[cmpLen] = '\n';
-					res = fsQuickWrite("lastdir.txt", lastDir, cmpLen + 1);
+					res = fsQuickWrite("lastdir.txt", lastDir, strlen(lastDir));
 				}
 			}
 		} while(0);