diff --git a/src/flt_spoe.c b/src/flt_spoe.c
index 0a1eab6..5495f26 100644
--- a/src/flt_spoe.c
+++ b/src/flt_spoe.c
@@ -2401,7 +2401,10 @@
 		    ((struct spoe_config *)FLT_CONF(ctx->filter))->agent->var_pfx,
 		    (int)sz, str);
 
-	spoe_set_var(ctx, scope, str, sz, &smp);
+	if (smp.data.type == SMP_T_ANY)
+		spoe_unset_var(ctx, scope, str, sz, &smp);
+	else
+		spoe_set_var(ctx, scope, str, sz, &smp);
 
 	ret  = (p - *buf);
 	*buf = p;