diff --git a/examples/bootloader-multiboot2-grub/linker.ld b/examples/bootloader-multiboot2-grub/linker.ld
index b75a316..a85f5e4 100644
--- a/examples/bootloader-multiboot2-grub/linker.ld
+++ b/examples/bootloader-multiboot2-grub/linker.ld
@@ -1,7 +1,7 @@
 OUTPUT_ARCH("i386")
 ENTRY(_start)
 
-_kernel_offset = 0xC0000000; /* 3 GiB */
+_kernel_offset = 0xc0000000; /* 3 GiB */
 
 _kernel_phys_base = 4M;
 _kernel_virt_base = (_kernel_phys_base + _kernel_offset);
diff --git a/examples/bootloader-multiboot2-limine/linker.ld b/examples/bootloader-multiboot2-limine/linker.ld
index b75a316..a85f5e4 100644
--- a/examples/bootloader-multiboot2-limine/linker.ld
+++ b/examples/bootloader-multiboot2-limine/linker.ld
@@ -1,7 +1,7 @@
 OUTPUT_ARCH("i386")
 ENTRY(_start)
 
-_kernel_offset = 0xC0000000; /* 3 GiB */
+_kernel_offset = 0xc0000000; /* 3 GiB */
 
 _kernel_phys_base = 4M;
 _kernel_virt_base = (_kernel_phys_base + _kernel_offset);
diff --git a/include/kernaux/arch/i386.h b/include/kernaux/arch/i386.h
index 3aeddc8..40280dc 100644
--- a/include/kernaux/arch/i386.h
+++ b/include/kernaux/arch/i386.h
@@ -16,12 +16,12 @@ extern "C" {
 #define KERNAUX_ARCH_I386_PAGES_COUNT_MAX (1024 * 1024)
 
 #define KERNAUX_ARCH_I386_ADDR_TO_PDE_INDEX(addr) \
-    ((((uint32_t)addr) & 0xFFFFFFFF) >> 22)
+    ((((uint32_t)addr) & 0xffffffff) >> 22)
 #define KERNAUX_ARCH_I386_ADDR_TO_PTE_INDEX(addr) \
-    (((((uint32_t)addr) & 0xFFFFFFFF) >> 12) & 0x3FF)
+    (((((uint32_t)addr) & 0xffffffff) >> 12) & 0x3ff)
 
 #define KERNAUX_ARCH_I386_ADDR_TO_PDE_ADDR(addr) \
-    ((((uint32_t)addr) & 0xFFFFFFFF) >> 12)
+    ((((uint32_t)addr) & 0xffffffff) >> 12)
 #define KERNAUX_ARCH_I386_ADDR_TO_PTE_ADDR(addr) \
     KERNAUX_ARCH_I386_ADDR_TO_PDE_ADDR(addr)
 
diff --git a/include/kernaux/elf.h b/include/kernaux/elf.h
index a805f3c..5da1dbb 100644
--- a/include/kernaux/elf.h
+++ b/include/kernaux/elf.h
@@ -8,7 +8,7 @@ extern "C" {
 #include <stdbool.h>
 
 struct KernAux_ELF_Header {
-    unsigned magic_0x7F     : 8;
+    unsigned magic_0x7f     : 8;
     unsigned magic_E        : 8;
     unsigned magic_L        : 8;
     unsigned magic_F        : 8;
diff --git a/include/kernaux/mbr.h b/include/kernaux/mbr.h
index 354052a..7c41f73 100644
--- a/include/kernaux/mbr.h
+++ b/include/kernaux/mbr.h
@@ -9,7 +9,7 @@ extern "C" {
 #include <stdint.h>
 
 #define KERNAUX_MBR_SIZE 512
-#define KERNAUX_MBR_MAGIC 0xAA55
+#define KERNAUX_MBR_MAGIC 0xaa55
 #define KERNAUX_MBR_ENTRIES 4
 
 #define KERNAUX_MBR_BOOTSTRAP_SIZE \
diff --git a/include/kernaux/multiboot2.h b/include/kernaux/multiboot2.h
index 81d993b..2324d56 100644
--- a/include/kernaux/multiboot2.h
+++ b/include/kernaux/multiboot2.h
@@ -8,8 +8,8 @@ extern "C" {
 #include <stdint.h>
 #include <stdbool.h>
 
-#define KERNAUX_MULTIBOOT2_HEADER_MAGIC 0xE85250D6
-#define KERNAUX_MULTIBOOT2_INFO_MAGIC   0x36D76289
+#define KERNAUX_MULTIBOOT2_HEADER_MAGIC 0xe85250d6
+#define KERNAUX_MULTIBOOT2_INFO_MAGIC   0x36d76289
 
 #define KERNAUX_MULTIBOOT2_HEADER_ALIGN 4
 
diff --git a/pkgs/ruby/spec/lib/kernaux/sprintf_spec.rb b/pkgs/ruby/spec/lib/kernaux/sprintf_spec.rb
index 92ebfdb..8c50327 100644
--- a/pkgs/ruby/spec/lib/kernaux/sprintf_spec.rb
+++ b/pkgs/ruby/spec/lib/kernaux/sprintf_spec.rb
@@ -16,7 +16,7 @@ RSpec.describe KernAux, '.sprintf' do
     context 'using original tests' do
       [
         [' 4232',                  ['% d', 4232]],
-        ['This is a test of 12EF', ['This is a test of %X', 0x12EF]],
+        ['This is a test of 12EF', ['This is a test of %X', 0x12ef]],
         ['-1000',                  ['%d', -1000]],
         ['-1',                     ['%d', -1]],
         ['2345',                   ['%d', 2345]],
diff --git a/src/console.c b/src/console.c
index a63b3fb..300bab8 100644
--- a/src/console.c
+++ b/src/console.c
@@ -29,10 +29,10 @@ static void kernaux_console_printf_putc(
 void kernaux_console_putc(const char c __attribute__((unused)))
 {
 #ifdef ASM_I386
-    kernaux_asm_i386_outportb(0x3F8, c);
+    kernaux_asm_i386_outportb(0x3f8, c);
 #endif
 #ifdef ASM_X86_64
-    kernaux_asm_x86_64_outportb(0x3F8, c);
+    kernaux_asm_x86_64_outportb(0x3f8, c);
 #endif
 }
 
diff --git a/src/elf.c b/src/elf.c
index e072bc3..8ec0459 100644
--- a/src/elf.c
+++ b/src/elf.c
@@ -8,7 +8,7 @@ bool KernAux_ELF_Header_is_valid(
     const struct KernAux_ELF_Header *const header
 ) {
     if (!(
-        header->magic_0x7F     == 0x7F &&
+        header->magic_0x7f     == 0x7f &&
         header->magic_E        == 'E'  &&
         header->magic_L        == 'L'  &&
         header->magic_F        == 'F'  &&
@@ -42,10 +42,10 @@ bool KernAux_ELF_Header_is_valid(
         header->obj_type == 0x02   || // EXEC
         header->obj_type == 0x03   || // DYN
         header->obj_type == 0x04   || // CORE
-        header->obj_type == 0xFE00 || // LOOS
-        header->obj_type == 0xFEFF || // HIOS
-        header->obj_type == 0xFF00 || // LOPROC
-        header->obj_type == 0xFFFF    // HIPROC
+        header->obj_type == 0xfe00 || // LOOS
+        header->obj_type == 0xfeff || // HIOS
+        header->obj_type == 0xff00 || // LOPROC
+        header->obj_type == 0xffff    // HIPROC
     )) {
         return false;
     }
diff --git a/src/printf.c b/src/printf.c
index e55d1d4..9e3b8f5 100644
--- a/src/printf.c
+++ b/src/printf.c
@@ -770,7 +770,7 @@ size_t _etoa(out_fct_type out, char* buffer, size_t idx, size_t maxlen, double v
     } conv;
 
     conv.F = value;
-    int exp2 = (int)((conv.U >> 52u) & 0x07FFU) - 1023; // effectively log2
+    int exp2 = (int)((conv.U >> 52u) & 0x07ffu) - 1023; // effectively log2
     conv.U = (conv.U & ((1ull << 52u) - 1u)) | (102ull << 52u); // drop the exponent so conv.F is now in [1,2)
     // now approximate log10 from the log2 integer part and an expansion of ln around 1.5
     int expval = (int)(0.1760912590558 + exp2 * 0.301029995663981 + (conv.F - 1.5) * 0.289529654602168);