diff --git a/meta/recipes-devtools/gcc/gcc-configure-runtime.inc b/meta/recipes-devtools/gcc/gcc-configure-runtime.inc
index 2d214afe51..339a3c8a72 100644
--- a/meta/recipes-devtools/gcc/gcc-configure-runtime.inc
+++ b/meta/recipes-devtools/gcc/gcc-configure-runtime.inc
@@ -1,7 +1,6 @@
 require gcc-configure-common.inc
 
-CXXFLAGS = "${@oe_filter_out('-fvisibility-inlines-hidden',
-'${CXXFLAGS}', d)}" 
+CXXFLAGS := "${@oe_filter_out('-fvisibility-inlines-hidden', '${CXXFLAGS}', d)}"
 
 EXTRA_OECONF_PATHS = " \
     --with-local-prefix=${STAGING_DIR_TARGET}${prefix} \