diff --git a/src/usb/CMakeLists.txt b/src/usb/CMakeLists.txt
index 786c49b..e021c5d 100644
--- a/src/usb/CMakeLists.txt
+++ b/src/usb/CMakeLists.txt
@@ -1,14 +1,12 @@
-set (mraa_LIB_SRCS_NOAUTO ${mraa_LIB_SRCS_NOAUTO}
-  ${PROJECT_SOURCE_DIR}/src/usb/usb.c
-)
+set (mraa_LIB_USB_SRCS_NOAUTO ${PROJECT_SOURCE_DIR}/src/usb/usb.c)
 
 if (FTDI4222)
-   message (INFO " - FTDI4222")
-  set (mraa_LIB_SRCS_NOAUTO ${mraa_LIB_SRCS_NOAUTO}
+  message (INFO " - FTDI4222")
+  set (mraa_LIB_USB_SRCS_NOAUTO ${mraa_LIB_USB_SRCS_NOAUTO}
     ${PROJECT_SOURCE_DIR}/src/usb/ftdi_ft4222.c
-    PARENT_SCOPE
   )
 endif ()
 
-
+set (mraa_LIB_PLAT_SRCS_NOAUTO ${mraa_LIB_PLAT_SRCS_NOAUTO}
+     ${mraa_LIB_USB_SRCS_NOAUTO} PARENT_SCOPE)