diff --git a/Zend/zend_API.h b/Zend/zend_API.h
index d78ee6604e3..60acbd63044 100644
--- a/Zend/zend_API.h
+++ b/Zend/zend_API.h
@@ -445,10 +445,10 @@ ZEND_API zend_result zend_update_class_constant(zend_class_constant *c, const ze
 ZEND_API zend_result zend_update_class_constants(zend_class_entry *class_type);
 ZEND_API HashTable *zend_separate_class_constants_table(const zend_class_entry *class_type);
 
-static zend_always_inline HashTable *zend_class_constants_table(zend_class_entry *ce) {
+static zend_always_inline const HashTable *zend_class_constants_table(const zend_class_entry *ce) {
 	if ((ce->ce_flags & ZEND_ACC_HAS_AST_CONSTANTS) && ZEND_MAP_PTR(ce->mutable_data)) {
-		zend_class_mutable_data *mutable_data =
-			(zend_class_mutable_data*)ZEND_MAP_PTR_GET_IMM(ce->mutable_data);
+		const zend_class_mutable_data *mutable_data =
+			(const zend_class_mutable_data*)ZEND_MAP_PTR_GET_IMM(ce->mutable_data);
 		if (mutable_data && mutable_data->constants_table) {
 			return mutable_data->constants_table;
 		} else {
@@ -459,10 +459,10 @@ static zend_always_inline HashTable *zend_class_constants_table(zend_class_entry
 	}
 }
 
-static zend_always_inline zval *zend_class_default_properties_table(zend_class_entry *ce) {
+static zend_always_inline zval *zend_class_default_properties_table(const zend_class_entry *ce) {
 	if ((ce->ce_flags & ZEND_ACC_HAS_AST_PROPERTIES) && ZEND_MAP_PTR(ce->mutable_data)) {
-		zend_class_mutable_data *mutable_data =
-			(zend_class_mutable_data*)ZEND_MAP_PTR_GET_IMM(ce->mutable_data);
+		const zend_class_mutable_data *mutable_data =
+			(const zend_class_mutable_data*)ZEND_MAP_PTR_GET_IMM(ce->mutable_data);
 		return mutable_data->default_properties_table;
 	} else {
 		return ce->default_properties_table;
@@ -479,10 +479,10 @@ static zend_always_inline void zend_class_set_backed_enum_table(zend_class_entry
 	}
 }
 
-static zend_always_inline HashTable *zend_class_backed_enum_table(zend_class_entry *ce)
+static zend_always_inline HashTable *zend_class_backed_enum_table(const zend_class_entry *ce)
 {
 	if (ZEND_MAP_PTR(ce->mutable_data) && ce->type == ZEND_USER_CLASS) {
-		zend_class_mutable_data *mutable_data = (zend_class_mutable_data*)ZEND_MAP_PTR_GET_IMM(ce->mutable_data);
+		const zend_class_mutable_data *mutable_data = (const zend_class_mutable_data*)ZEND_MAP_PTR_GET_IMM(ce->mutable_data);
 		return mutable_data->backed_enum_table;
 	} else {
 		return ce->backed_enum_table;
diff --git a/Zend/zend_constants.c b/Zend/zend_constants.c
index a18c393be7f..8704c523d11 100644
--- a/Zend/zend_constants.c
+++ b/Zend/zend_constants.c
@@ -251,7 +251,7 @@ ZEND_API zend_constant *_zend_get_special_const(const char *name, size_t len) /*
 }
 /* }}} */
 
-ZEND_API bool zend_verify_const_access(zend_class_constant *c, zend_class_entry *scope) /* {{{ */
+ZEND_API bool zend_verify_const_access(const zend_class_constant *c, const zend_class_entry *scope) /* {{{ */
 {
 	if (ZEND_CLASS_CONST_FLAGS(c) & ZEND_ACC_PUBLIC) {
 		return 1;
@@ -312,9 +312,9 @@ ZEND_API zval *zend_get_constant(zend_string *name)
 	return NULL;
 }
 
-ZEND_API zval *zend_get_class_constant_ex(zend_string *class_name, zend_string *constant_name, zend_class_entry *scope, uint32_t flags)
+ZEND_API zval *zend_get_class_constant_ex(zend_string *class_name, zend_string *constant_name, const zend_class_entry *scope, uint32_t flags)
 {
-	zend_class_entry *ce = NULL;
+	const zend_class_entry *ce = NULL;
 	zend_class_constant *c = NULL;
 	zval *ret_constant = NULL;
 
@@ -413,7 +413,7 @@ failure:
 	return ret_constant;
 }
 
-ZEND_API zval *zend_get_constant_ex(zend_string *cname, zend_class_entry *scope, uint32_t flags)
+ZEND_API zval *zend_get_constant_ex(zend_string *cname, const zend_class_entry *scope, uint32_t flags)
 {
 	zend_constant *c;
 	const char *colon;
@@ -495,7 +495,7 @@ ZEND_API zval *zend_get_constant_ex(zend_string *cname, zend_class_entry *scope,
 	return &c->value;
 }
 
-static void* zend_hash_add_constant(HashTable *ht, zend_string *key, zend_constant *c)
+static void* zend_hash_add_constant(HashTable *ht, zend_string *key, const zend_constant *c)
 {
 	void *ret;
 	zend_constant *copy = pemalloc(sizeof(zend_constant), ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT);
diff --git a/Zend/zend_constants.h b/Zend/zend_constants.h
index 6bdb19c4d5a..3d7f60920bc 100644
--- a/Zend/zend_constants.h
+++ b/Zend/zend_constants.h
@@ -85,12 +85,12 @@ void clean_module_constants(int module_number);
 void free_zend_constant(zval *zv);
 void zend_startup_constants(void);
 void zend_register_standard_constants(void);
-ZEND_API bool zend_verify_const_access(zend_class_constant *c, zend_class_entry *ce);
+ZEND_API bool zend_verify_const_access(const zend_class_constant *c, const zend_class_entry *ce);
 ZEND_API zval *zend_get_constant(zend_string *name);
 ZEND_API zend_constant *zend_get_constant_ptr(zend_string *name);
 ZEND_API zval *zend_get_constant_str(const char *name, size_t name_len);
-ZEND_API zval *zend_get_constant_ex(zend_string *name, zend_class_entry *scope, uint32_t flags);
-ZEND_API zval *zend_get_class_constant_ex(zend_string *class_name, zend_string *constant_name, zend_class_entry *scope, uint32_t flags);
+ZEND_API zval *zend_get_constant_ex(zend_string *name, const zend_class_entry *scope, uint32_t flags);
+ZEND_API zval *zend_get_class_constant_ex(zend_string *class_name, zend_string *constant_name, const zend_class_entry *scope, uint32_t flags);
 ZEND_API zend_constant *zend_register_bool_constant(const char *name, size_t name_len, bool bval, int flags, int module_number);
 ZEND_API zend_constant *zend_register_null_constant(const char *name, size_t name_len, int flags, int module_number);
 ZEND_API zend_constant *zend_register_long_constant(const char *name, size_t name_len, zend_long lval, int flags, int module_number);
diff --git a/ext/reflection/php_reflection.c b/ext/reflection/php_reflection.c
index ac3f64fed23..957339b869e 100644
--- a/ext/reflection/php_reflection.c
+++ b/ext/reflection/php_reflection.c
@@ -4820,7 +4820,7 @@ ZEND_METHOD(ReflectionClass, getConstant)
 {
 	reflection_object *intern;
 	zend_class_entry *ce;
-	HashTable *constants_table;
+	const HashTable *constants_table;
 	zend_class_constant *c;
 	zend_string *name, *key;