diff --git a/include/kernaux/arch/i386.h b/include/kernaux/arch/i386.h
index aec25c3..ef1c04e 100644
--- a/include/kernaux/arch/i386.h
+++ b/include/kernaux/arch/i386.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_ARCH_I386
-#define KERNAUX_INCLUDED_ARCH_I386 1
+#define KERNAUX_INCLUDED_ARCH_I386
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/arch/x86_64.h b/include/kernaux/arch/x86_64.h
index 748d276..73afd64 100644
--- a/include/kernaux/arch/x86_64.h
+++ b/include/kernaux/arch/x86_64.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_ARCH_X86_64
-#define KERNAUX_INCLUDED_ARCH_X86_64 1
+#define KERNAUX_INCLUDED_ARCH_X86_64
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/asm/i386.h b/include/kernaux/asm/i386.h
index 68e933f..e0e98c8 100644
--- a/include/kernaux/asm/i386.h
+++ b/include/kernaux/asm/i386.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_ASM_I386
-#define KERNAUX_INCLUDED_ASM_I386 1
+#define KERNAUX_INCLUDED_ASM_I386
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/asm/x86_64.h b/include/kernaux/asm/x86_64.h
index c9ebdd1..89308ea 100644
--- a/include/kernaux/asm/x86_64.h
+++ b/include/kernaux/asm/x86_64.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_ASM_X86_64
-#define KERNAUX_INCLUDED_ASM_X86_64 1
+#define KERNAUX_INCLUDED_ASM_X86_64
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/assert.h b/include/kernaux/assert.h
index dcf2470..4817119 100644
--- a/include/kernaux/assert.h
+++ b/include/kernaux/assert.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_ASSERT
-#define KERNAUX_INCLUDED_ASSERT 1
+#define KERNAUX_INCLUDED_ASSERT
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/cmdline.h b/include/kernaux/cmdline.h
index 8a74fef..73e177e 100644
--- a/include/kernaux/cmdline.h
+++ b/include/kernaux/cmdline.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_CMDLINE
-#define KERNAUX_INCLUDED_CMDLINE 1
+#define KERNAUX_INCLUDED_CMDLINE
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/console.h b/include/kernaux/console.h
index d6c5ef4..00aa2d2 100644
--- a/include/kernaux/console.h
+++ b/include/kernaux/console.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_CONSOLE
-#define KERNAUX_INCLUDED_CONSOLE 1
+#define KERNAUX_INCLUDED_CONSOLE
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/elf.h b/include/kernaux/elf.h
index ac1f950..a805f3c 100644
--- a/include/kernaux/elf.h
+++ b/include/kernaux/elf.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_ELF
-#define KERNAUX_INCLUDED_ELF 1
+#define KERNAUX_INCLUDED_ELF
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/itoa.h b/include/kernaux/itoa.h
index 8bc26ba..94aa19b 100644
--- a/include/kernaux/itoa.h
+++ b/include/kernaux/itoa.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_ITOA
-#define KERNAUX_INCLUDED_ITOA 1
+#define KERNAUX_INCLUDED_ITOA
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/libc.h b/include/kernaux/libc.h
index 0cda705..1eea995 100644
--- a/include/kernaux/libc.h
+++ b/include/kernaux/libc.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_LIBC
-#define KERNAUX_INCLUDED_LIBC 1
+#define KERNAUX_INCLUDED_LIBC
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/multiboot2.h b/include/kernaux/multiboot2.h
index 061c592..bebc2b5 100644
--- a/include/kernaux/multiboot2.h
+++ b/include/kernaux/multiboot2.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_MULTIBOOT2
-#define KERNAUX_INCLUDED_MULTIBOOT2 1
+#define KERNAUX_INCLUDED_MULTIBOOT2
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/pfa.h b/include/kernaux/pfa.h
index afe9cc3..c6904bb 100644
--- a/include/kernaux/pfa.h
+++ b/include/kernaux/pfa.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_PFA
-#define KERNAUX_INCLUDED_PFA 1
+#define KERNAUX_INCLUDED_PFA
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/include/kernaux/printf.h b/include/kernaux/printf.h
index 8f954c6..2ce5718 100644
--- a/include/kernaux/printf.h
+++ b/include/kernaux/printf.h
@@ -1,5 +1,5 @@
 #ifndef KERNAUX_INCLUDED_PRINTF
-#define KERNAUX_INCLUDED_PRINTF 1
+#define KERNAUX_INCLUDED_PRINTF
 
 #ifdef __cplusplus
 extern "C" {