diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 0bbf84bdcdc4..2ed55161bca5 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -302,7 +302,7 @@ int acpi_get_psd_map(struct cpudata **all_cpu_data)
 }
 EXPORT_SYMBOL_GPL(acpi_get_psd_map);
 
-static int register_pcc_channel(unsigned pcc_subspace_idx)
+static int register_pcc_channel(int pcc_subspace_idx)
 {
 	struct acpi_pcct_subspace *cppc_ss;
 	unsigned int len;