diff --git a/kernel/Makefile b/kernel/Makefile
index 4857147..f9ecb06 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -28,12 +28,6 @@ CFLAGS += -I. \
 					-DPICO_SUPPORT_IPV4 \
 					-DPICO_SUPPORT_MUTEX \
 
-ifeq ($(PUTCHAR_),fb)
-CFLAGS += -DPUTCHAR_=PUTCHAR_FB
-else
-CFLAGS += -DPUTCHAR_=PUTCHAR_SERIAL
-endif
-
 include arch/$(ARCH)/$(ARCH).mk
 include extconf/extra.mk
 
diff --git a/kernel/putchar.h b/kernel/putchar.h
deleted file mode 100644
index 1c4334d..0000000
--- a/kernel/putchar.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef PUTCHAR_H_
-#define PUTCHAR_H_
-
-#define PUTCHAR_FB 1
-#define PUTCHAR_SERIAL 2
-
-#endif // PUTCHAR_H_
diff --git a/kernel/term/term.c b/kernel/term/term.c
index b9f49bc..910f7f5 100644
--- a/kernel/term/term.c
+++ b/kernel/term/term.c
@@ -3,7 +3,6 @@
 #include "spinlock/spinlock.h"
 #include "bootinfo/bootinfo.h"
 #include "term.h"
-#include "putchar.h"
 #include "fm-t-437.f16.h"
 
 Term TERM;
@@ -48,9 +47,7 @@ void term_write_unsafe(const char *s, size_t len) {
   flanterm_write(TERM.ftctx, s, len);
 }
 
-#if PUTCHAR_ == PUTCHAR_FB
-  // For printf library
-  void putchar_(char c) {
-    term_write_unsafe(&c, 1);
-  }
-#endif
+// For printf library
+void putchar_(char c) {
+  term_write_unsafe(&c, 1);
+}