diff --git a/backend_qt4/backend_qt4.pro b/backend_qt4/backend_qt4.pro
index 501f2378..2dc1fa57 100644
--- a/backend_qt4/backend_qt4.pro
+++ b/backend_qt4/backend_qt4.pro
@@ -59,6 +59,8 @@ HEADERS += ../backend/common.h \
 
 SOURCES += ../backend/2of5.c \
            ../backend/auspost.c \
+           ../backend/aztec.c \
+           ../backend/blockf.c \
            ../backend/code.c \
            ../backend/code128.c \
            ../backend/code16k.c \