diff --git a/config/functions b/config/functions
index 66f44c439c..648b466734 100644
--- a/config/functions
+++ b/config/functions
@@ -242,12 +242,12 @@ setup_toolchain() {
   fi
 
   # parallel
-  if ! flag_enabled "parallel" "yes"; then
-    NINJA_OPTS="$NINJA_OPTS -j1"
-    export MAKEFLAGS="-j1"
-  else
+  if flag_enabled "parallel" "yes"; then
     NINJA_OPTS="$NINJA_OPTS -j$CONCURRENCY_MAKE_LEVEL"
     export MAKEFLAGS="-j$CONCURRENCY_MAKE_LEVEL"
+  else
+    NINJA_OPTS="$NINJA_OPTS -j1"
+    export MAKEFLAGS="-j1"
   fi
 
   # verbose flag