diff --git a/parser.c b/parser.c
index e1d139d5d..c66dbae47 100644
--- a/parser.c
+++ b/parser.c
@@ -14696,7 +14696,12 @@ xmlCleanupParser(void) {
 static void
 ATTRIBUTE_DESTRUCTOR
 xmlDestructor(void) {
-    xmlCleanupParser();
+    /*
+     * Calling custom deallocation functions in a destructor can cause
+     * problems, for example with Nokogiri.
+     */
+    if (xmlFree == free)
+        xmlCleanupParser();
 }
 #endif