diff --git a/panda/src/display/graphicsWindow.h b/panda/src/display/graphicsWindow.h
index 4289785676..fb46f520a8 100644
--- a/panda/src/display/graphicsWindow.h
+++ b/panda/src/display/graphicsWindow.h
@@ -72,8 +72,8 @@ class EXPCL_PANDA GraphicsWindow : public Configurable, public ReferenceCount {
 PUBLISHED:
   class EXPCL_PANDA Properties {
   PUBLISHED:
-    Properties();
-    Properties(const Properties &);
+    INLINE Properties();
+    INLINE Properties(const Properties &);
     INLINE ~Properties();
 
     INLINE void set_origin(int xorg, int yorg);