diff --git a/exec-memory.h b/exec-memory.h
index 1cd92eec71..6707e40b2f 100644
--- a/exec-memory.h
+++ b/exec-memory.h
@@ -33,12 +33,6 @@ MemoryRegion *get_system_memory(void);
  */
 MemoryRegion *get_system_io(void);
 
-/* Set the root memory region.  This region is the system memory map. */
-void set_system_memory_map(MemoryRegion *mr);
-
-/* Set the I/O memory region.  This region is the I/O memory map. */
-void set_system_io_map(MemoryRegion *mr);
-
 #endif
 
 #endif
diff --git a/exec.c b/exec.c
index 5d5d9e33c9..dfc0a784f3 100644
--- a/exec.c
+++ b/exec.c
@@ -116,6 +116,9 @@ RAMList ram_list = { .blocks = QLIST_HEAD_INITIALIZER(ram_list.blocks) };
 static MemoryRegion *system_memory;
 static MemoryRegion *system_io;
 
+static AddressSpace address_space_io;
+static AddressSpace address_space_memory;
+
 MemoryRegion io_mem_ram, io_mem_rom, io_mem_unassigned, io_mem_notdirty;
 static MemoryRegion io_mem_subpage_ram;
 
@@ -3235,11 +3238,13 @@ static void memory_map_init(void)
 {
     system_memory = g_malloc(sizeof(*system_memory));
     memory_region_init(system_memory, "system", INT64_MAX);
-    set_system_memory_map(system_memory);
+    address_space_init(&address_space_memory, system_memory);
+    address_space_memory.name = "memory";
 
     system_io = g_malloc(sizeof(*system_io));
     memory_region_init(system_io, "io", 65536);
-    set_system_io_map(system_io);
+    address_space_init(&address_space_io, system_io);
+    address_space_io.name = "I/O";
 
     memory_listener_register(&core_memory_listener, system_memory);
     memory_listener_register(&io_memory_listener, system_io);
diff --git a/memory.c b/memory.c
index d829f67419..49a6ecc6c8 100644
--- a/memory.c
+++ b/memory.c
@@ -364,8 +364,6 @@ static void access_with_adjusted_size(target_phys_addr_t addr,
     }
 }
 
-static AddressSpace address_space_memory;
-
 static const MemoryRegionPortio *find_portio(MemoryRegion *mr, uint64_t offset,
                                              unsigned width, bool write)
 {
@@ -454,8 +452,6 @@ const IORangeOps memory_region_iorange_ops = {
     .destructor = memory_region_iorange_destructor,
 };
 
-static AddressSpace address_space_io;
-
 static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
 {
     AddressSpace *as;
@@ -1545,18 +1541,6 @@ void address_space_init(AddressSpace *as, MemoryRegion *root)
     memory_region_transaction_commit();
 }
 
-void set_system_memory_map(MemoryRegion *mr)
-{
-    address_space_init(&address_space_memory, mr);
-    address_space_memory.name = "memory";
-}
-
-void set_system_io_map(MemoryRegion *mr)
-{
-    address_space_init(&address_space_io, mr);
-    address_space_io.name = "I/O";
-}
-
 uint64_t io_mem_read(MemoryRegion *mr, target_phys_addr_t addr, unsigned size)
 {
     return memory_region_dispatch_read(mr, addr, size);