diff --git a/src/arch/amd64/acpi.c b/src/arch/amd64/acpi.c
index 59e9621..887bfef 100644
--- a/src/arch/amd64/acpi.c
+++ b/src/arch/amd64/acpi.c
@@ -246,7 +246,7 @@ static void acpi_load_xsdt_tables(struct xsdt *xsdt) {
 #define SIG_RSDT    0x54445352
 #define SIG_XSDT    0x54445358
 #define SIG_FACP    0x50434146
-#define SIG_DSDT	0x54445344
+#define SIG_DSDT    0x54445344
 #define SIG_APIC    0x43495041
 #define SIG_HEPT    0x54455048
 #define SIG_WAET    0x54454157