diff --git a/gfx/src/beos/nsDrawingSurfaceBeOS.cpp b/gfx/src/beos/nsDrawingSurfaceBeOS.cpp
index 970ff7766301..2fc09e484fe4 100644
--- a/gfx/src/beos/nsDrawingSurfaceBeOS.cpp
+++ b/gfx/src/beos/nsDrawingSurfaceBeOS.cpp
@@ -21,6 +21,7 @@
  */
 
 #include "nsDrawingSurfaceBeOS.h"
+#include "nsCoord.h"
 
 NS_IMPL_ISUPPORTS2(nsDrawingSurfaceBeOS, nsIDrawingSurface, nsIDrawingSurfaceBeOS)