diff --git a/meta-arm/meta-arm/classes/fvpboot.bbclass b/meta-arm/meta-arm/classes/fvpboot.bbclass
index 508deb2..3159cd4 100644
--- a/meta-arm/meta-arm/classes/fvpboot.bbclass
+++ b/meta-arm/meta-arm/classes/fvpboot.bbclass
@@ -24,7 +24,8 @@
 # Arbitrary extra arguments
 FVP_EXTRA_ARGS ?= ""
 # Bitbake variables to pass to the FVP environment
-FVP_ENV_PASSTHROUGH ?= "FASTSIM_DISABLE_TA"
+FVP_ENV_PASSTHROUGH ?= "FASTSIM_DISABLE_TA ARMLMD_LICENSE_FILE"
+FVP_ENV_PASSTHROUGH[vardeps] = "${FVP_ENV_PASSTHROUGH}"
 # Disable timing annotation by default
 FASTSIM_DISABLE_TA ?= "1"
 
@@ -72,7 +73,8 @@
 
     data["env"] = {}
     for var in d.getVar("FVP_ENV_PASSTHROUGH").split():
-        data["env"][var] = d.getVar(var)
+        if d.getVar(var) is not None:
+            data["env"][var] = d.getVar(var)
 
     os.makedirs(os.path.dirname(conffile), exist_ok=True)
     with open(conffile, "wt") as f: