diff --git a/Makefile b/Makefile
index 8cae919..d404b1f 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ i386-linux-handwrite: planck.xxd
 	chmod +x planck
 
 c: others/planck.c
-	gcc -Wall -O2 $< -o planck -DCOMPILER="\"`gcc --version | head -n1`\""
+	gcc -Wall -O2 $< -o planck -DCOMPILER="$(shell gcc --version | head -n1)"
 
 python: others/planck.py
 	cp others/planck.py planck
diff --git a/others/planck.c b/others/planck.c
index 86f4dd6..1ef7ae5 100644
--- a/others/planck.c
+++ b/others/planck.c
@@ -14,7 +14,8 @@
 #include <unistd.h>
 
 #define COPYRIGHT "Copyright (c) 2021 Koichi Nakamura <koichi@idein.jp>"
-#define RUNTIME_NAME COMPILER
+#define STRINGIFY(s) #s
+#define RUNTIME_NAME STRINGIFY(COMPILER)
 
 #define VERSION RUNTIME_NAME ":" COPYRIGHT