diff --git a/lib/base/object.hpp b/lib/base/object.hpp
index a29e4f73b..7836d2644 100644
--- a/lib/base/object.hpp
+++ b/lib/base/object.hpp
@@ -23,6 +23,7 @@
 #include "base/i2-base.hpp"
 #include "base/debug.hpp"
 #include <boost/smart_ptr/intrusive_ptr.hpp>
+#include <cstddef>
 #include <vector>
 
 using boost::intrusive_ptr;
@@ -212,6 +213,7 @@ private:
 #	else /* _WIN32 */
 	mutable DWORD m_LockOwner;
 #	endif /* _WIN32 */
+	mutable size_t m_LockCount = 0;
 #endif /* I2_DEBUG */
 
 	friend struct ObjectLock;
diff --git a/lib/base/objectlock.cpp b/lib/base/objectlock.cpp
index 2abb43fba..c3d3f0522 100644
--- a/lib/base/objectlock.cpp
+++ b/lib/base/objectlock.cpp
@@ -90,11 +90,13 @@ void ObjectLock::Lock()
 	m_Locked = true;
 
 #ifdef I2_DEBUG
+	if (++m_Object->m_LockCount == 1u) {
 #	ifdef _WIN32
-	InterlockedExchange(&m_Object->m_LockOwner, GetCurrentThreadId());
+		InterlockedExchange(&m_Object->m_LockOwner, GetCurrentThreadId());
 #	else /* _WIN32 */
-	__sync_lock_test_and_set(&m_Object->m_LockOwner, pthread_self());
+		__sync_lock_test_and_set(&m_Object->m_LockOwner, pthread_self());
 #	endif /* _WIN32 */
+	}
 #endif /* I2_DEBUG */
 }
 
@@ -120,7 +122,7 @@ void ObjectLock::Spin(unsigned int it)
 void ObjectLock::Unlock()
 {
 #ifdef I2_DEBUG
-	if (m_Locked) {
+	if (m_Locked && !--m_Object->m_LockCount) {
 #	ifdef _WIN32
 		InterlockedExchange(&m_Object->m_LockOwner, 0);
 #	else /* _WIN32 */