diff --git a/eval.c b/eval.c
index a405857f9aebe1..382d9fb5c8656e 100644
--- a/eval.c
+++ b/eval.c
@@ -78,7 +78,6 @@ ruby_setup(void)
     prctl(PR_SET_THP_DISABLE, 1, 0, 0, 0);
 #endif
     Init_BareVM();
-    Init_heap();
     rb_vm_encoded_insn_data_table_init();
     Init_vm_objects();
 
diff --git a/gc.c b/gc.c
index 474f16e7dbbcbd..6c83c5d0ad23ab 100644
--- a/gc.c
+++ b/gc.c
@@ -1884,40 +1884,6 @@ rb_gc_initial_stress_set(VALUE flag)
     initial_stress = flag;
 }
 
-rb_objspace_t *
-rb_objspace_alloc(void)
-{
-    rb_objspace_t *objspace = calloc1(sizeof(rb_objspace_t));
-
-    objspace->flags.gc_stressful = RTEST(initial_stress);
-    objspace->gc_stress_mode = initial_stress;
-
-    objspace->flags.measure_gc = 1;
-    malloc_limit = gc_params.malloc_limit_min;
-    objspace->finalize_deferred_pjob = rb_postponed_job_preregister(0, gc_finalize_deferred, objspace);
-    if (objspace->finalize_deferred_pjob == POSTPONED_JOB_HANDLE_INVALID) {
-        rb_bug("Could not preregister postponed job for GC");
-    }
-
-    for (int i = 0; i < SIZE_POOL_COUNT; i++) {
-        rb_size_pool_t *size_pool = &size_pools[i];
-
-        size_pool->slot_size = (1 << i) * BASE_SLOT_SIZE;
-
-        ccan_list_head_init(&SIZE_POOL_EDEN_HEAP(size_pool)->pages);
-        ccan_list_head_init(&SIZE_POOL_TOMB_HEAP(size_pool)->pages);
-    }
-
-    rb_darray_make(&objspace->weak_references, 0);
-
-    // TODO: debug why on Windows Ruby crashes on boot when GC is on.
-#ifdef _WIN32
-    dont_gc_on();
-#endif
-
-    return objspace;
-}
-
 static void free_stack_chunks(mark_stack_t *);
 static void mark_stack_free_cache(mark_stack_t *);
 static void heap_page_free(rb_objspace_t *objspace, struct heap_page *page);
@@ -3523,10 +3489,37 @@ static const struct st_hash_type object_id_hash_type = {
     object_id_hash,
 };
 
-void
-Init_heap(void)
+rb_objspace_t *
+rb_objspace_alloc(void)
 {
-    rb_objspace_t *objspace = &rb_objspace;
+    rb_objspace_t *objspace = calloc1(sizeof(rb_objspace_t));
+    ruby_current_vm_ptr->objspace = objspace;
+
+    objspace->flags.gc_stressful = RTEST(initial_stress);
+    objspace->gc_stress_mode = initial_stress;
+
+    objspace->flags.measure_gc = 1;
+    malloc_limit = gc_params.malloc_limit_min;
+    objspace->finalize_deferred_pjob = rb_postponed_job_preregister(0, gc_finalize_deferred, objspace);
+    if (objspace->finalize_deferred_pjob == POSTPONED_JOB_HANDLE_INVALID) {
+        rb_bug("Could not preregister postponed job for GC");
+    }
+
+    for (int i = 0; i < SIZE_POOL_COUNT; i++) {
+        rb_size_pool_t *size_pool = &size_pools[i];
+
+        size_pool->slot_size = (1 << i) * BASE_SLOT_SIZE;
+
+        ccan_list_head_init(&SIZE_POOL_EDEN_HEAP(size_pool)->pages);
+        ccan_list_head_init(&SIZE_POOL_TOMB_HEAP(size_pool)->pages);
+    }
+
+    rb_darray_make(&objspace->weak_references, 0);
+
+    // TODO: debug why on Windows Ruby crashes on boot when GC is on.
+#ifdef _WIN32
+    dont_gc_on();
+#endif
 
 #if defined(INIT_HEAP_PAGE_ALLOC_USE_MMAP)
     /* Need to determine if we can use mmap at runtime. */
@@ -3556,6 +3549,7 @@ Init_heap(void)
 
     objspace->profile.invoke_time = getrusage_time();
     finalizer_table = st_init_numtable();
+    return objspace;
 }
 
 typedef int each_obj_callback(void *, void *, size_t, void *);
diff --git a/internal/inits.h b/internal/inits.h
index 03e180f77bd026..03de289dd4236c 100644
--- a/internal/inits.h
+++ b/internal/inits.h
@@ -19,9 +19,6 @@ void Init_ext(void);
 /* file.c */
 void Init_File(void);
 
-/* gc.c */
-void Init_heap(void);
-
 /* localeinit.c */
 int Init_enc_set_filesystem_encoding(void);
 
diff --git a/vm.c b/vm.c
index 36f6700ad7d459..328187c790a327 100644
--- a/vm.c
+++ b/vm.c
@@ -4244,7 +4244,7 @@ Init_BareVM(void)
 
     rb_vm_postponed_job_queue_init(vm);
     ruby_current_vm_ptr = vm;
-    vm->objspace = rb_objspace_alloc();
+    rb_objspace_alloc();
     vm->negative_cme_table = rb_id_table_create(16);
     vm->overloaded_cme_table = st_init_numtable();
     vm->constant_cache = rb_id_table_create(0);