diff --git a/meta-arm/classes/wic_nopt.bbclass b/meta-arm/classes/wic_nopt.bbclass
index 322be498..9c78fd77 100644
--- a/meta-arm/classes/wic_nopt.bbclass
+++ b/meta-arm/classes/wic_nopt.bbclass
@@ -1,7 +1,7 @@
 # This class removes the empty partition table header
 # in the WIC file when --no-table WKS option is used
 
-IMAGE_TYPES += "wic.nopt"
+IMAGE_TYPES:append = " wic.nopt"
 
 CONVERSIONTYPES += "nopt"