diff --git a/package/qt5/qt5base/qmake.conf b/package/qt5/qt5base/qmake.conf
index 2152d3c7a4..49cf898316 100644
--- a/package/qt5/qt5base/qmake.conf
+++ b/package/qt5/qt5base/qmake.conf
@@ -19,6 +19,7 @@ QMAKE_CXXFLAGS_RELEASE += -O3
 CONFIG                 += nostrip
 
 QMAKE_LIBS             += -lrt -lpthread -ldl
+QMAKE_CFLAGS_ISYSTEM   =
 
 include(../common/linux_device_post.conf)
 load(qt_config)