diff --git a/src/arch/x86/acpi_s3.c b/src/arch/x86/acpi_s3.c
index f3cb0971db..0fc1914bef 100644
--- a/src/arch/x86/acpi_s3.c
+++ b/src/arch/x86/acpi_s3.c
@@ -27,7 +27,7 @@
 #if ENV_RAMSTAGE
 
 /* This is filled with acpi_is_wakeup() call early in ramstage. */
-int acpi_slp_type = -1;
+static int acpi_slp_type = -1;
 
 #if IS_ENABLED(CONFIG_EARLY_CBMEM_INIT)
 int acpi_get_sleep_type(void)
diff --git a/src/arch/x86/include/arch/acpi.h b/src/arch/x86/include/arch/acpi.h
index 7c296480bc..6854573d8c 100644
--- a/src/arch/x86/include/arch/acpi.h
+++ b/src/arch/x86/include/arch/acpi.h
@@ -691,7 +691,6 @@ static inline int acpi_s3_resume_allowed(void)
 void *acpi_backup_container(uintptr_t base, size_t size);
 
 #if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
-extern int acpi_slp_type;
 
 #ifdef __PRE_RAM__
 static inline int acpi_is_wakeup_s3(void)
@@ -706,7 +705,6 @@ int acpi_is_wakeup_s4(void);
 void acpi_prepare_for_resume(void);
 
 #else
-#define acpi_slp_type ACPI_S0
 static inline int acpi_is_wakeup(void) { return 0; }
 static inline int acpi_is_wakeup_s3(void) { return 0; }
 static inline int acpi_is_wakeup_s4(void) { return 0; }