diff --git a/ci/fvp-base.yml b/ci/fvp-base.yml
index 43b2f190..037e36ef 100644
--- a/ci/fvp-base.yml
+++ b/ci/fvp-base.yml
@@ -7,7 +7,7 @@ machine: fvp-base
 
 local_conf_header:
   testimagefvp: |
-    INHERIT = "fvpboot"
+    INHERIT += "fvpboot"
     # This fails but we can't add to the ignorelist from meta-arm yet
     # https://bugzilla.yoctoproject.org/show_bug.cgi?id=14604
     TEST_SUITES:remove = "parselogs"