diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 4188a4d..aad1f2a 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -228,10 +228,7 @@
 
 extern int acpi_processor_register_performance(struct acpi_processor_performance
 					       *performance, unsigned int cpu);
-extern void acpi_processor_unregister_performance(struct
-						  acpi_processor_performance
-						  *performance,
-						  unsigned int cpu);
+extern void acpi_processor_unregister_performance(unsigned int cpu);
 
 /* note: this locks both the calling module and the processor module
          if a _PPC object exists, rmmod is disallowed then */