diff --git a/lib/lib.pro b/lib/lib.pro
index e9689fa393f5b6df823db25f43b1255fa74128dc..dbfde8c59729726578eed3dbb1ca3575095ee91e 100644
--- a/lib/lib.pro
+++ b/lib/lib.pro
@@ -23,6 +23,9 @@ RESOURCES += lib_resources.qrc
 # We need this to find the include files generated for the .pak resource files.
 INCLUDEPATH += $$absolute_path(../resources, $$PWD)
 
+# something fishy with qmake in 5.2 ?
+INCLUDEPATH += $$[QT_INSTALL_HEADERS]
+
 SOURCES = \
         backing_store_qt.cpp \
         content_browser_client_qt.cpp \
diff --git a/shared/shared.pro b/shared/shared.pro
index 108a9a255cc91f0b305f39ea0b09ddafda7077ff..a125819e05b5d25c134a055c0c7fddff18a6c564 100644
--- a/shared/shared.pro
+++ b/shared/shared.pro
@@ -13,6 +13,9 @@ TARGET = qtwebengine_shared
 DEFINES += QT_NO_KEYWORDS \
            Q_FORWARD_DECLARE_OBJC_CLASS=QT_FORWARD_DECLARE_CLASS
 
+# something fishy with qmake in 5.2 ?
+INCLUDEPATH += $$[QT_INSTALL_HEADERS]
+
 # We need a way to tap into gyp´s Debug vs. Release configuration
 PER_CONFIG_DEFINES = QTWEBENGINEPROCESS_PATH=\\\"$$getOutDir()/%config/$$QTWEBENGINEPROCESS_NAME\\\"