diff --git a/modules/juce_gui_basics/native/juce_linux_Windowing.cpp b/modules/juce_gui_basics/native/juce_linux_Windowing.cpp
index bea6b35cca..74e2da4f12 100644
--- a/modules/juce_gui_basics/native/juce_linux_Windowing.cpp
+++ b/modules/juce_gui_basics/native/juce_linux_Windowing.cpp
@@ -1465,7 +1465,7 @@ public:
         {
             lastMousePos = mousePos;
 
-            if (parentWindow != nullptr && (styleFlags & windowHasTitleBar) == 0)
+            if (parentWindow != 0 && (styleFlags & windowHasTitleBar) == 0)
             {
                 Window wRoot = 0, wParent = 0;