diff --git a/headers/private/kernel/vm/vm.h b/headers/private/kernel/vm/vm.h
index 60d8d10831..00c9f406eb 100644
--- a/headers/private/kernel/vm/vm.h
+++ b/headers/private/kernel/vm/vm.h
@@ -141,6 +141,7 @@ void vm_get_info(struct system_memory_info *info);
 uint32 vm_num_page_faults(void);
 off_t vm_available_memory(void);
 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);
diff --git a/src/system/kernel/vm/vm.cpp b/src/system/kernel/vm/vm.cpp
index 0c7623c345..2b52d238cb 100644
--- a/src/system/kernel/vm/vm.cpp
+++ b/src/system/kernel/vm/vm.cpp
@@ -4406,6 +4406,16 @@ vm_available_not_needed_memory(void)
 }
 
 
+/*!	Like vm_available_not_needed_memory(), but only for use in the kernel
+	debugger.
+*/
+off_t
+vm_available_not_needed_memory_debug(void)
+{
+	return sAvailableMemory - sNeededMemory;
+}
+
+
 size_t
 vm_kernel_address_space_left(void)
 {