diff --git a/meta/recipes-devtools/expect/expect_5.45.4.bb b/meta/recipes-devtools/expect/expect_5.45.4.bb
index 158e7af030..174b35ec73 100644
--- a/meta/recipes-devtools/expect/expect_5.45.4.bb
+++ b/meta/recipes-devtools/expect/expect_5.45.4.bb
@@ -85,4 +85,4 @@ BBCLASSEXTEND = "native nativesdk"
 
 # http://errors.yoctoproject.org/Errors/Details/766950/
 # expect5.45.4/exp_chan.c:62:5: error: initialization of 'struct Tcl_ChannelTypeVersion_ *' from incompatible pointer type 'int (*)(void *, int)' [-Wincompatible-pointer-types]
-CFLAGS:append = " -Wno-error=incompatible-pointer-types"
+CFLAGS += "-Wno-error=incompatible-pointer-types"