diff --git a/src/tests/servers/app/Jamfile b/src/tests/servers/app/Jamfile
index 24598d765f8..2e7c888a511 100644
--- a/src/tests/servers/app/Jamfile
+++ b/src/tests/servers/app/Jamfile
@@ -152,6 +152,7 @@ SharedLibrary libtestappserver.so :
 	MallocBuffer.cpp
 
 	AlphaMask.cpp
+	AlphaMaskCache.cpp
 	BitmapHWInterface.cpp
 	Canvas.cpp
 	DesktopSettings.cpp