diff --git a/ext/-test-/random/loop.c b/ext/-test-/random/loop.c
index 4f7c800500..ec4eff013e 100644
--- a/ext/-test-/random/loop.c
+++ b/ext/-test-/random/loop.c
@@ -38,7 +38,7 @@ loop_alloc(VALUE klass)
 {
     rand_loop_t *rnd;
     VALUE obj = TypedData_Make_Struct(klass, rand_loop_t, &random_loop_type, rnd);
-    rnd->base.seed = INT2FIX(0);
+    rb_random_base_init(&rnd->base);
     return obj;
 }
 
diff --git a/include/ruby/random.h b/include/ruby/random.h
index 1d45dc25b9..2e7ac75a01 100644
--- a/include/ruby/random.h
+++ b/include/ruby/random.h
@@ -71,6 +71,7 @@ typedef const rb_data_type_t rb_random_data_type_t;
 #endif
 
 void rb_random_mark(void *ptr);
+void rb_random_base_init(rb_random_t *rnd);
 double rb_int_pair_to_real(uint32_t a, uint32_t b, int excl);
 void rb_rand_bytes_int32(rb_random_get_int32_func *, rb_random_t *, void *, size_t);
 RUBY_EXTERN const rb_data_type_t rb_random_data_type;
diff --git a/random.c b/random.c
index 4ceff377e3..587e93c89d 100644
--- a/random.c
+++ b/random.c
@@ -296,13 +296,20 @@ try_rand_if(VALUE obj, rb_random_t *rnd)
     return rb_rand_if(obj);
 }
 
+/* :nodoc: */
+void
+rb_random_base_init(rb_random_t *rnd)
+{
+    rnd->seed = INT2FIX(0);
+}
+
 /* :nodoc: */
 static VALUE
 random_alloc(VALUE klass)
 {
     rb_random_mt_t *rnd;
     VALUE obj = TypedData_Make_Struct(klass, rb_random_mt_t, &random_mt_type, rnd);
-    rnd->base.seed = INT2FIX(0);
+    rb_random_base_init(&rnd->base);
     return obj;
 }