diff --git a/Zend/tests/bug37632.phpt b/Zend/tests/bug37632.phpt
new file mode 100755
index 00000000000..fb72f893457
--- /dev/null
+++ b/Zend/tests/bug37632.phpt
@@ -0,0 +1,135 @@
+--TEST--
+Bug #37632 (Protected method access problem)
+--FILE--
+<?php
+
+class A1
+{
+	protected function test()
+	{
+		echo __METHOD__ . "\n";
+	}
+}
+
+class B1 extends A1
+{
+	public function doTest(A1 $obj)
+	{
+		echo __METHOD__ . "\n";
+		$obj->test();
+	}
+}
+
+class C1 extends A1
+{
+	protected function test()
+	{
+		echo __METHOD__ . "\n";
+	}
+}
+
+$b = new B1;
+$b->doTest(new C1);
+
+class A2
+{
+	static protected function test()
+	{
+		echo __METHOD__ . "\n";
+	}
+}
+
+class B2 extends A2
+{
+	static public function doTest(A2 $obj)
+	{
+		echo __METHOD__ . "\n";
+		$obj->test();
+	}
+}
+
+class C2 extends A2
+{
+	static protected function test()
+	{
+		echo __METHOD__ . "\n";
+	}
+}
+
+B2::doTest(new C2);
+
+/* Right now Ctor's cannot be made protected when defined in a ctor. That is
+ * we cannot decrease visibility.
+ *
+
+interface Ctor
+{
+	function __construct($x);
+}
+
+class A3 implements Ctor
+{
+	protected function __construct()
+	{
+		echo __METHOD__ . "\n";
+	}
+}
+
+class B3 extends A3
+{
+	static public function doTest()
+	{
+		echo __METHOD__ . "\n";
+		new C3;
+	}
+}
+
+class C3 extends A3
+{
+	protected function __construct()
+	{
+		echo __METHOD__ . "\n";
+	}
+}
+
+B3::doTest();
+
+*/
+
+class A4
+{
+	protected function __construct()
+	{
+		echo __METHOD__ . "\n";
+	}
+}
+
+class B4 extends A4
+{
+	static public function doTest()
+	{
+		echo __METHOD__ . "\n";
+		new C4;
+	}
+}
+
+class C4 extends A4
+{
+	protected function __construct()
+	{
+		echo __METHOD__ . "\n";
+	}
+}
+
+B4::doTest();
+
+?>
+===DONE===
+--EXPECTF--
+B1::doTest
+C1::test
+B2::doTest
+C2::test
+B4::doTest
+
+Fatal error: Call to protected C4::__construct() from context 'B4' in %sbug37632.php on line %d
diff --git a/Zend/zend_compile.c b/Zend/zend_compile.c
index 8eb69d8f113..cf2c7fe3d0d 100644
--- a/Zend/zend_compile.c
+++ b/Zend/zend_compile.c
@@ -2028,8 +2028,9 @@ static zend_bool do_inherit_method_check(HashTable *child_function_table, zend_f
 	if (parent_flags & ZEND_ACC_ABSTRACT) {
 		child->common.fn_flags |= ZEND_ACC_IMPLEMENTED_ABSTRACT;
 		child->common.prototype = parent;
-	} else {
-		child->common.prototype = parent->common.prototype;
+	} else if (!(parent->common.fn_flags & ZEND_ACC_CTOR) || (parent->common.prototype && parent->common.prototype->common.scope->ce_flags && ZEND_ACC_INTERFACE)) {
+		/* ctors only have a prototype if it comes from an interface */
+		child->common.prototype = parent->common.prototype ? parent->common.prototype : parent;
 	}
 
 
diff --git a/Zend/zend_object_handlers.c b/Zend/zend_object_handlers.c
index bdcebd3d43e..57fdff3674d 100644
--- a/Zend/zend_object_handlers.c
+++ b/Zend/zend_object_handlers.c
@@ -724,6 +724,12 @@ ZEND_API int zend_check_protected(zend_class_entry *ce, zend_class_entry *scope)
 }
 
 
+static inline zend_class_entry * zend_get_function_root_class(zend_function *fbc)
+{
+	return fbc->common.prototype ? fbc->common.prototype->common.scope : fbc->common.scope;
+}
+
+
 static union _zend_function *zend_std_get_method(zval **object_ptr, char *method_name, int method_len TSRMLS_DC)
 {
 	zend_object *zobj;
@@ -784,7 +790,7 @@ static union _zend_function *zend_std_get_method(zval **object_ptr, char *method
 	} else if ((fbc->common.fn_flags & ZEND_ACC_PROTECTED)) {
 		/* Ensure that if we're calling a protected function, we're allowed to do so.
 		 */
-		if (!zend_check_protected(fbc->common.scope, EG(scope))) {
+		if (!zend_check_protected(zend_get_function_root_class(fbc), EG(scope))) {
 			zend_error(E_ERROR, "Call to %s method %s::%s() from context '%s'", zend_visibility_string(fbc->common.fn_flags), ZEND_FN_SCOPE_NAME(fbc), method_name, EG(scope) ? EG(scope)->name : "");
 		}
 	}
@@ -822,7 +828,7 @@ ZEND_API zend_function *zend_std_get_static_method(zend_class_entry *ce, char *f
 	} else if ((fbc->common.fn_flags & ZEND_ACC_PROTECTED)) {
 		/* Ensure that if we're calling a protected function, we're allowed to do so.
 		 */
-		if (!zend_check_protected(EG(scope), fbc->common.scope)) {
+		if (!zend_check_protected(zend_get_function_root_class(fbc), EG(scope))) {
 			zend_error(E_ERROR, "Call to %s method %s::%s() from context '%s'", zend_visibility_string(fbc->common.fn_flags), ZEND_FN_SCOPE_NAME(fbc), function_name_strval, EG(scope) ? EG(scope)->name : "");
 		}
 	}
@@ -898,7 +904,7 @@ static union _zend_function *zend_std_get_constructor(zval *object TSRMLS_DC)
 		} else if ((constructor->common.fn_flags & ZEND_ACC_PROTECTED)) {
 			/* Ensure that if we're calling a protected function, we're allowed to do so.
 			 */
-			if (!zend_check_protected(constructor->common.scope, EG(scope))) {
+			if (!zend_check_protected(zend_get_function_root_class(constructor), EG(scope))) {
 				zend_error(E_ERROR, "Call to protected %s::%s() from context '%s'", constructor->common.scope->name, constructor->common.function_name, EG(scope) ? EG(scope)->name : "");
 			}
 		}