diff --git a/Zend/tests/bug78658.phpt b/Zend/tests/bug78658.phpt
new file mode 100644
index 00000000000..3445b98b097
--- /dev/null
+++ b/Zend/tests/bug78658.phpt
@@ -0,0 +1,14 @@
+--TEST--
+Bug #78658: Memory corruption using Closure::bindTo()
+--FILE--
+<?php
+
+$c = function(){};
+
+$scope = "AAAA";
+$scope = "{$scope}BBBB";
+$c->bindTo(new stdClass, $scope);
+
+?>
+--EXPECTF--
+Warning: Class 'AAAABBBB' not found in %s on line %d
diff --git a/Zend/zend_closures.c b/Zend/zend_closures.c
index 4ed0b16b62d..f5d692ad32e 100644
--- a/Zend/zend_closures.c
+++ b/Zend/zend_closures.c
@@ -212,7 +212,7 @@ ZEND_METHOD(Closure, bind)
 				ce = closure->func.common.scope;
 			} else if ((ce = zend_lookup_class(class_name)) == NULL) {
 				zend_error(E_WARNING, "Class '%s' not found", ZSTR_VAL(class_name));
-				zend_string_release_ex(class_name, 0);
+				zend_tmp_string_release(tmp_class_name);
 				RETURN_NULL();
 			}
 			zend_tmp_string_release(tmp_class_name);