diff --git a/YACReader/YACReader.pro b/YACReader/YACReader.pro
index f53b9fdd..ce134a66 100644
--- a/YACReader/YACReader.pro
+++ b/YACReader/YACReader.pro
@@ -86,6 +86,10 @@ macx{
 #INCLUDEPATH  += /usr/local/include/poppler/qt4
 #LIBS         += -L/usr/local/lib -lpoppler-qt4
 #}
+
+#TODO: pdfium support
+DEFINES += "USE_PDFKIT"
+
 CONFIG += objective_c
 QT += macextras gui-private
 
diff --git a/YACReaderLibrary/YACReaderLibrary.pro b/YACReaderLibrary/YACReaderLibrary.pro
index c247823a..81356f40 100644
--- a/YACReaderLibrary/YACReaderLibrary.pro
+++ b/YACReaderLibrary/YACReaderLibrary.pro
@@ -76,6 +76,9 @@ macx{
 #}
 #QT += macextras
 
+#TODO:support for pdfium on mac
+DEFINES += "USE_PDFKIT"
+
 LIBS += -framework Foundation -framework ApplicationServices -framework AppKit
 
 OBJECTIVE_SOURCES += $$PWD/../common/pdf_comic.mm