diff --git a/Zend/zend_inheritance.c b/Zend/zend_inheritance.c
index 4d73dd003a31..a4c759add64b 100644
--- a/Zend/zend_inheritance.c
+++ b/Zend/zend_inheritance.c
@@ -2847,6 +2847,7 @@ static void zend_do_traits_constant_binding(zend_class_entry *ce, zend_class_ent
 				constant->ce = ce;
 
 				Z_TRY_ADDREF(constant->value);
+				zend_type_copy_ctor(&constant->type, /* use_arena */ true, /* persistent */ false);
 				constant->doc_comment = constant->doc_comment ? zend_string_copy(constant->doc_comment) : NULL;
 				if (constant->attributes && (!(GC_FLAGS(constant->attributes) & IS_ARRAY_IMMUTABLE))) {
 					GC_ADDREF(constant->attributes);
@@ -3489,6 +3490,7 @@ static zend_class_entry *zend_lazy_class_load(zend_class_entry *pce)
 			Z_PTR(p->val) = new_c;
 			memcpy(new_c, c, sizeof(zend_class_constant));
 			new_c->ce = ce;
+			zend_type_copy_ctor(&new_c->type, /* use_arena */ true, /* persistent */ false);
 		}
 	}
 
diff --git a/Zend/zend_opcode.c b/Zend/zend_opcode.c
index 317f68b486bb..4edd1fbc7cb9 100644
--- a/Zend/zend_opcode.c
+++ b/Zend/zend_opcode.c
@@ -421,6 +421,9 @@ ZEND_API void destroy_zend_class(zval *zv)
 							zend_hash_release(c->attributes);
 						}
 					}
+					if (c->ce == ce) {
+						zend_type_release(c->type, /* persistent */ 0);
+					}
 				} ZEND_HASH_FOREACH_END();
 			}
 			zend_hash_destroy(&ce->constants_table);
diff --git a/ext/opcache/tests/gh25149.phpt b/ext/opcache/tests/gh25149.phpt
new file mode 100644
index 000000000000..657dc193d1a6
--- /dev/null
+++ b/ext/opcache/tests/gh25149.phpt
@@ -0,0 +1,29 @@
+--TEST--
+GH-25149 (Memory leak of class constant type names in classes not cached by opcache)
+--EXTENSIONS--
+opcache
+--INI--
+opcache.enable_cli=1
+--FILE--
+<?php
+
+eval('class A { const ?GH25149_B C = null; }');
+eval('class D { const GH25149_E|GH25149_F|null G = null; }');
+var_dump(A::C, D::G);
+
+eval('trait T { const ?GH25149_H I = null; const GH25149_J|GH25149_K|null L = null; }');
+eval('class M { use T; }');
+var_dump(M::I, M::L);
+
+eval('class N {}');
+class O extends N { const ?GH25149_P Q = null; const GH25149_R|GH25149_S|null U = null; }
+var_dump(O::Q, O::U);
+
+?>
+--EXPECT--
+NULL
+NULL
+NULL
+NULL
+NULL
+NULL