diff --git a/GUI/CMakeLists.txt b/GUI/CMakeLists.txt
index 3c041d7..07497cc 100644
--- a/GUI/CMakeLists.txt
+++ b/GUI/CMakeLists.txt
@@ -12,8 +12,8 @@ set(gui_SRCS
     extenwindow.cpp
 	setdialog.cpp
 	tests.cpp
-	host/host.cc
-	host/textthread.cc
+	host/host.cpp
+	host/textthread.cpp
 	host/util.cpp
 	${RESOURCE_FILES}
 )
diff --git a/GUI/host/host.cc b/GUI/host/host.cpp
similarity index 100%
rename from GUI/host/host.cc
rename to GUI/host/host.cpp
diff --git a/GUI/host/textthread.cc b/GUI/host/textthread.cpp
similarity index 100%
rename from GUI/host/textthread.cc
rename to GUI/host/textthread.cpp