diff --git a/ground/src/plugins/serialconnection/serialconnection.pro b/ground/src/plugins/serialconnection/serialconnection.pro
index 7cfa0648f..c7921b2a2 100644
--- a/ground/src/plugins/serialconnection/serialconnection.pro
+++ b/ground/src/plugins/serialconnection/serialconnection.pro
@@ -2,7 +2,7 @@ TEMPLATE = lib
 TARGET = Serial
 include(../../openpilotgcsplugin.pri)
 include(serial_dependencies.pri)
-INCLUDEPATH += ../../libs\qextserialport\src
+INCLUDEPATH += ../../libs/qextserialport/src
 HEADERS += serialplugin.h \
     serial_global.h
 SOURCES += serialplugin.cpp