diff --git a/Makefile b/Makefile
index 427b6ae..bee68df 100644
--- a/Makefile
+++ b/Makefile
@@ -7,6 +7,7 @@ mp4: build run convert-mp4 clean
 build:
 	nasm -f elf64 main.s -o main.o
 	ld main.o -o gen
+	strip gen
 
 run:
 	./gen
@@ -18,6 +19,6 @@ convert-mp4:
 	ffmpeg -i output-%02d.ppm -r 60 output.mp4
 
 clean:
-	rm -rf output-*.ppm
+	rm -rf output-*.ppm *.o *.core
 
 .PHONY: all gif mp4 build run convert-gif convert-mp4 clean
diff --git a/main.s b/main.s
index 97abce5..2723f0a 100644
--- a/main.s
+++ b/main.s
@@ -51,7 +51,7 @@ frameloop:
   lea rsi, [suffix]
   call strcpy         ; 「.ppm\0」の追加
 
-  mov rax, 5          ; sys_openat
+  mov rax, 5          ; sys_open
   lea rdi, [outfile]
   mov rsi, 0x100601   ; 0x100601 = 0001 0000 0000 0110 0000 0001 = 1048576 + 1024 + 512 + 1 = 1050113
                       ;   O_WRONLY  = 0x0001