diff --git a/config/functions b/config/functions
index 094cc514af..c20d577ab0 100644
--- a/config/functions
+++ b/config/functions
@@ -1,13 +1,8 @@
 setup_toolchain() {
-  # lto flag
-  if flag_enabled "lto" "$LTO_SUPPORT" "only-disable"; then
+  if [ "$LTO_SUPPORT" = "yes" ] && flag_enabled "lto" "no"; then
     TARGET_CFLAGS+=" $CFLAGS_OPTIM_LTO"
     TARGET_CXXFLAGS+=" $CXXFLAGS_OPTIM_LTO"
     TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_LTO"
-  else
-    TARGET_CFLAGS+=" $CFLAGS_OPTIM_NOLTO"
-    TARGET_CXXFLAGS+=" $CXXFLAGS_OPTIM_NOLTO"
-    TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_NOLTO"
   fi
 
   # gold flag