diff --git a/meta-yocto/conf/local.conf.sample b/meta-yocto/conf/local.conf.sample
index da4a01e95c..93c85c222e 100644
--- a/meta-yocto/conf/local.conf.sample
+++ b/meta-yocto/conf/local.conf.sample
@@ -220,8 +220,8 @@ BB_DISKMON_DIRS = "\
 # By default qemu will build with a builtin VNC server where graphical output can be
 # seen. The two lines below enable the SDL backend too. This assumes there is a
 # libsdl library available on your build system.
-PACKAGECONFIG_pn-qemu-native = "sdl"
-PACKAGECONFIG_pn-nativesdk-qemu = "sdl"
+PACKAGECONFIG_append_pn-qemu-native = " sdl"
+PACKAGECONFIG_append_pn-nativesdk-qemu = " sdl"
 ASSUME_PROVIDED += "libsdl-native"