diff --git a/lib/remote/apilistener-configsync.cpp b/lib/remote/apilistener-configsync.cpp
index a12db0bca..04436ad8b 100644
--- a/lib/remote/apilistener-configsync.cpp
+++ b/lib/remote/apilistener-configsync.cpp
@@ -8,6 +8,7 @@
 #include "base/json.hpp"
 #include "base/convert.hpp"
 #include "config/vmops.hpp"
+#include "remote/configobjectslock.hpp"
 #include <fstream>
 
 using namespace icinga;
@@ -104,6 +105,11 @@ Value ApiListener::ConfigUpdateObjectAPIHandler(const MessageOrigin::Ptr& origin
 		return Empty;
 	}
 
+	// Wait for the object name to become available for processing and block it immediately.
+	// Doing so guarantees that only one (create/update/delete) cluster event or API request of a
+	// given object is being processed at any given time.
+	ObjectNameLock objectNameLock(ptype, objName);
+
 	ConfigObject::Ptr object = ctype->GetObject(objName);
 
 	String config = params->Get("config");
@@ -258,6 +264,11 @@ Value ApiListener::ConfigDeleteObjectAPIHandler(const MessageOrigin::Ptr& origin
 		return Empty;
 	}
 
+	// Wait for the object name to become available for processing and block it immediately.
+	// Doing so guarantees that only one (create/update/delete) cluster event or API request of a
+	// given object is being processed at any given time.
+	ObjectNameLock objectNameLock(ptype, objName);
+
 	ConfigObject::Ptr object = ctype->GetObject(objName);
 
 	if (!object) {