diff --git a/headers/private/kernel/vm/vm.h b/headers/private/kernel/vm/vm.h
index 1962f418a2..9aa7f2154a 100644
--- a/headers/private/kernel/vm/vm.h
+++ b/headers/private/kernel/vm/vm.h
@@ -149,7 +149,7 @@ off_t vm_available_not_needed_memory(void);
 off_t vm_available_not_needed_memory_debug(void);
 size_t vm_kernel_address_space_left(void);
 
-status_t vm_memset_physical(phys_addr_t address, int value, size_t length);
+status_t vm_memset_physical(phys_addr_t address, int value, phys_size_t length);
 status_t vm_memcpy_from_physical(void* to, phys_addr_t from, size_t length,
 			bool user);
 status_t vm_memcpy_to_physical(phys_addr_t to, const void* from, size_t length,
diff --git a/src/system/kernel/vm/vm.cpp b/src/system/kernel/vm/vm.cpp
index 2e5a3747dd..7afa856d9d 100644
--- a/src/system/kernel/vm/vm.cpp
+++ b/src/system/kernel/vm/vm.cpp
@@ -4975,7 +4975,7 @@ vm_resize_area(area_id areaID, size_t newSize, bool kernel)
 
 
 status_t
-vm_memset_physical(phys_addr_t address, int value, size_t length)
+vm_memset_physical(phys_addr_t address, int value, phys_size_t length)
 {
 	return sPhysicalPageMapper->MemsetPhysical(address, value, length);
 }