diff --git a/NEWS b/NEWS
index d1d7335c132..c7765950f8c 100644
--- a/NEWS
+++ b/NEWS
@@ -48,6 +48,9 @@ PHP                                                                        NEWS
   . Fixed bug GH-19801 (leaks in var_dump() and debug_zval_dump()).
     (alexandre-daubois)
 
+- XMLReader:
+  . Fixed bug GH-20009 (XMLReader leak on RelaxNG schema failure). (nielsdos)
+
 - Zip:
   . Fixed bug GH-19688 (Remove pattern overflow in zip addGlob()). (nielsdos)
   . Fixed bug GH-19932 (Memory leak in zip setEncryptionName()/setEncryptionIndex()).
diff --git a/ext/xmlreader/php_xmlreader.c b/ext/xmlreader/php_xmlreader.c
index dca1898f1c0..7a50b660fb5 100644
--- a/ext/xmlreader/php_xmlreader.c
+++ b/ext/xmlreader/php_xmlreader.c
@@ -508,6 +508,7 @@ static void php_xmlreader_set_relaxng_schema(INTERNAL_FUNCTION_PARAMETERS, int t
 
 			RETURN_TRUE;
 		} else {
+			xmlRelaxNGFree(schema);
 			php_error_docref(NULL, E_WARNING, "Schema contains errors");
 			RETURN_FALSE;
 		}