diff --git a/src/xswiftbus/xswiftbus.pro b/src/xswiftbus/xswiftbus.pro
index f549a8d10..2cfe2040d 100644
--- a/src/xswiftbus/xswiftbus.pro
+++ b/src/xswiftbus/xswiftbus.pro
@@ -32,8 +32,8 @@ else:unix {
 DEPENDPATH += . $$SourceRoot/src
 INCLUDEPATH += . $$SourceRoot/src
 
-SOURCES += *.cpp
-HEADERS += *.h
+SOURCES += $$files($$PWD/*.cpp)
+HEADERS += $$files($$PWD/*.h)
 
 # Using the $$files function so we can remove some with -= below
 SOURCES += $$files(libxplanemp/src/*.cpp)