diff --git a/Zend/tests/bug79382_2.phpt b/Zend/tests/bug79382_2.phpt
new file mode 100644
index 0000000000000..d465ca54ca228
--- /dev/null
+++ b/Zend/tests/bug79382_2.phpt
@@ -0,0 +1,16 @@
+--TEST--
+Bug #79382: Cannot redeclare disabled function
+--INI--
+disable_functions=substr
+--FILE--
+<?php
+
+function substr() {
+	return 'foo';
+}
+
+var_dump(substr("bar"));
+
+?>
+--EXPECT--
+string(3) "foo"