diff --git a/ext/dom/documentfragment.c b/ext/dom/documentfragment.c
index 74b7f073741e1..76870faedfa4c 100644
--- a/ext/dom/documentfragment.c
+++ b/ext/dom/documentfragment.c
@@ -73,7 +73,7 @@ PHP_METHOD(DOMDocumentFragment, appendXML) {
 
 	DOM_GET_OBJ(nodep, id, xmlNodePtr, intern);
 
-	if (dom_node_is_read_only(nodep) == SUCCESS) {
+	if (dom_node_is_read_only(nodep)) {
 		php_dom_throw_error(NO_MODIFICATION_ALLOWED_ERR, dom_get_strict_error(intern->document));
 		RETURN_FALSE;
 	}
diff --git a/ext/dom/node.c b/ext/dom/node.c
index 55d3e2445472c..ee14fd158fc45 100644
--- a/ext/dom/node.c
+++ b/ext/dom/node.c
@@ -837,8 +837,8 @@ static xmlNodePtr dom_insert_fragment(xmlNodePtr nodep, xmlNodePtr prevsib, xmlN
 
 static bool dom_node_check_legacy_insertion_validity(xmlNodePtr parentp, xmlNodePtr child, bool stricterror, bool warn_empty_fragment)
 {
-	if (dom_node_is_read_only(parentp) == SUCCESS ||
-		(child->parent != NULL && dom_node_is_read_only(child->parent) == SUCCESS)) {
+	if (dom_node_is_read_only(parentp) ||
+		(child->parent != NULL && dom_node_is_read_only(child->parent))) {
 		php_dom_throw_error(NO_MODIFICATION_ALLOWED_ERR, stricterror);
 		return false;
 	}
@@ -1279,8 +1279,8 @@ static void dom_node_remove_child(INTERNAL_FUNCTION_PARAMETERS, zend_class_entry
 		RETURN_FALSE;
 	}
 
-	if (dom_node_is_read_only(nodep) == SUCCESS ||
-		(child->parent != NULL && dom_node_is_read_only(child->parent) == SUCCESS)) {
+	if (dom_node_is_read_only(nodep) ||
+		(child->parent != NULL && dom_node_is_read_only(child->parent))) {
 		php_dom_throw_error(NO_MODIFICATION_ALLOWED_ERR, stricterror);
 		RETURN_FALSE;
 	}
diff --git a/ext/dom/parentnode/tree.c b/ext/dom/parentnode/tree.c
index 9fb682910f071..f57fd1cc7335b 100644
--- a/ext/dom/parentnode/tree.c
+++ b/ext/dom/parentnode/tree.c
@@ -699,8 +699,8 @@ void dom_parent_node_before(dom_object *context, zval *nodes, uint32_t nodesc)
 
 static zend_result dom_child_removal_preconditions(const xmlNode *child, const dom_object *context)
 {
-	if (dom_node_is_read_only(child) == SUCCESS ||
-		(child->parent != NULL && dom_node_is_read_only(child->parent) == SUCCESS)) {
+	if (dom_node_is_read_only(child) ||
+		(child->parent != NULL && dom_node_is_read_only(child->parent))) {
 		php_dom_throw_error(NO_MODIFICATION_ALLOWED_ERR, dom_get_strict_error(context->document));
 		return FAILURE;
 	}
diff --git a/ext/dom/php_dom.c b/ext/dom/php_dom.c
index 0593700d32016..1327cfad6604b 100644
--- a/ext/dom/php_dom.c
+++ b/ext/dom/php_dom.c
@@ -155,7 +155,7 @@ typedef struct dom_prop_handler {
 	dom_write_t write_func;
 } dom_prop_handler;
 
-int dom_node_is_read_only(const xmlNode *node) {
+bool dom_node_is_read_only(const xmlNode *node) {
 	switch (node->type) {
 		case XML_ENTITY_REF_NODE:
 		case XML_ENTITY_NODE:
@@ -166,14 +166,9 @@ int dom_node_is_read_only(const xmlNode *node) {
 		case XML_ATTRIBUTE_DECL:
 		case XML_ENTITY_DECL:
 		case XML_NAMESPACE_DECL:
-			return SUCCESS;
-			break;
+			return true;
 		default:
-			if (node->doc == NULL) {
-				return SUCCESS;
-			} else {
-				return FAILURE;
-			}
+			return node->doc == NULL;
 	}
 }
 
diff --git a/ext/dom/php_dom.h b/ext/dom/php_dom.h
index e4013e448ae26..7dd8cc896b48a 100644
--- a/ext/dom/php_dom.h
+++ b/ext/dom/php_dom.h
@@ -147,7 +147,7 @@ xmlNode *dom_get_elements_by_tag_name_ns_raw(xmlNodePtr basep, xmlNodePtr nodep,
 void php_dom_create_implementation(zval *retval, bool modern);
 int dom_hierarchy(xmlNodePtr parent, xmlNodePtr child);
 bool dom_has_feature(zend_string *feature, zend_string *version);
-int dom_node_is_read_only(const xmlNode *node);
+bool dom_node_is_read_only(const xmlNode *node);
 bool dom_node_children_valid(const xmlNode *node);
 void php_dom_create_iterator(zval *return_value, dom_iterator_type iterator_type, bool modern);
 void dom_namednode_iter(dom_object *basenode, int ntype, dom_object *intern, xmlHashTablePtr ht, const char *local, size_t local_len, const char *ns, size_t ns_len);