diff --git a/arch/riscv/include/asm/acpi.h b/arch/riscv/include/asm/acpi.h
index e0a1f84404f3..6e13695120bc 100644
--- a/arch/riscv/include/asm/acpi.h
+++ b/arch/riscv/include/asm/acpi.h
@@ -91,10 +91,8 @@ static inline void acpi_get_cbo_block_size(struct acpi_table_header *table,
 #endif /* CONFIG_ACPI */
 
 #ifdef CONFIG_ACPI_NUMA
-int acpi_numa_get_nid(unsigned int cpu);
 void acpi_map_cpus_to_nodes(void);
 #else
-static inline int acpi_numa_get_nid(unsigned int cpu) { return NUMA_NO_NODE; }
 static inline void acpi_map_cpus_to_nodes(void) { }
 #endif /* CONFIG_ACPI_NUMA */
 
diff --git a/arch/riscv/kernel/acpi_numa.c b/arch/riscv/kernel/acpi_numa.c
index 0231482d6946..a93c773b60e6 100644
--- a/arch/riscv/kernel/acpi_numa.c
+++ b/arch/riscv/kernel/acpi_numa.c
@@ -30,7 +30,7 @@
 
 static int acpi_early_node_map[NR_CPUS] __initdata = { NUMA_NO_NODE };
 
-int __init acpi_numa_get_nid(unsigned int cpu)
+static int __init acpi_numa_get_nid(unsigned int cpu)
 {
 	return acpi_early_node_map[cpu];
 }