diff --git a/conf/machine/am335x-hw26-vcupro.conf b/conf/machine/am335x-hw26-vcupro.conf
index 6e84a86..69b6cd1 100644
--- a/conf/machine/am335x-hw26-vcupro.conf
+++ b/conf/machine/am335x-hw26-vcupro.conf
@@ -4,6 +4,6 @@
 # the new VCU pro was based on the changes done on NG800
 
 require am335x-hw26.conf
-MACHINEOVERRIDES .= ":am335x-hw26"
+MACHINEOVERRIDES =. "am335x-hw26:"
 
 USER_MODULE_MACHINE_FEATURE = "user-module"
diff --git a/conf/machine/am335x-hw26.conf b/conf/machine/am335x-hw26.conf
index d50b1cc..68c243a 100644
--- a/conf/machine/am335x-hw26.conf
+++ b/conf/machine/am335x-hw26.conf
@@ -5,7 +5,7 @@
 #require conf/machine/include/ti33x.inc
 require am335x-nmhw21.conf
 KERNEL_DEVICETREE_TO_USE = "${HW26_DT}"
-MACHINEOVERRIDES .= ":am335x-nmhw21"
+MACHINEOVERRIDES =. "am335x-nmhw21:"
 
 MACHINE_FEATURES += "pps"