diff --git a/src/cmd/deskflowc/OSXClientTaskBarReceiver.cpp b/src/cmd/deskflowc/OSXClientTaskBarReceiver.cpp
index dc8512c1c..bfe0fbf16 100644
--- a/src/cmd/deskflowc/OSXClientTaskBarReceiver.cpp
+++ b/src/cmd/deskflowc/OSXClientTaskBarReceiver.cpp
@@ -52,7 +52,7 @@ void OSXClientTaskBarReceiver::primaryAction()
 
 IArchTaskBarReceiver::Icon OSXClientTaskBarReceiver::getIcon() const
 {
-  return NULL;
+  return nullptr;
 }
 
 IArchTaskBarReceiver *createTaskBarReceiver(const BufferedLogOutputter *logBuffer, IEventQueue *events)
diff --git a/src/cmd/deskflowc/XWindowsClientTaskBarReceiver.cpp b/src/cmd/deskflowc/XWindowsClientTaskBarReceiver.cpp
index bb2d4e731..d077ed97e 100644
--- a/src/cmd/deskflowc/XWindowsClientTaskBarReceiver.cpp
+++ b/src/cmd/deskflowc/XWindowsClientTaskBarReceiver.cpp
@@ -52,7 +52,7 @@ void CXWindowsClientTaskBarReceiver::primaryAction()
 
 IArchTaskBarReceiver::Icon CXWindowsClientTaskBarReceiver::getIcon() const
 {
-  return NULL;
+  return nullptr;
 }
 
 IArchTaskBarReceiver *createTaskBarReceiver(const BufferedLogOutputter *logBuffer, IEventQueue *events)
diff --git a/src/cmd/deskflows/OSXServerTaskBarReceiver.cpp b/src/cmd/deskflows/OSXServerTaskBarReceiver.cpp
index c3233bab2..26b9f12e3 100644
--- a/src/cmd/deskflows/OSXServerTaskBarReceiver.cpp
+++ b/src/cmd/deskflows/OSXServerTaskBarReceiver.cpp
@@ -52,7 +52,7 @@ void OSXServerTaskBarReceiver::primaryAction()
 
 IArchTaskBarReceiver::Icon OSXServerTaskBarReceiver::getIcon() const
 {
-  return NULL;
+  return nullptr;
 }
 
 IArchTaskBarReceiver *createTaskBarReceiver(const BufferedLogOutputter *logBuffer, IEventQueue *events)
diff --git a/src/cmd/deskflows/XWindowsServerTaskBarReceiver.cpp b/src/cmd/deskflows/XWindowsServerTaskBarReceiver.cpp
index 6e18ad94f..bb71d0600 100644
--- a/src/cmd/deskflows/XWindowsServerTaskBarReceiver.cpp
+++ b/src/cmd/deskflows/XWindowsServerTaskBarReceiver.cpp
@@ -52,7 +52,7 @@ void CXWindowsServerTaskBarReceiver::primaryAction()
 
 IArchTaskBarReceiver::Icon CXWindowsServerTaskBarReceiver::getIcon() const
 {
-  return NULL;
+  return nullptr;
 }
 
 IArchTaskBarReceiver *createTaskBarReceiver(const BufferedLogOutputter *logBuffer, IEventQueue *events)