diff --git a/import-layers/yocto-poky/meta/classes/uboot-config.bbclass b/import-layers/yocto-poky/meta/classes/uboot-config.bbclass
index 3f760f2..10013b7 100644
--- a/import-layers/yocto-poky/meta/classes/uboot-config.bbclass
+++ b/import-layers/yocto-poky/meta/classes/uboot-config.bbclass
@@ -14,19 +14,19 @@
 UBOOT_BINARY ?= "u-boot.${UBOOT_SUFFIX}"
 
 python () {
-    ubootmachine = d.getVar("UBOOT_MACHINE", True)
+    ubootmachine = d.getVar("UBOOT_MACHINE")
     ubootconfigflags = d.getVarFlags('UBOOT_CONFIG')
-    ubootbinary = d.getVar('UBOOT_BINARY', True)
-    ubootbinaries = d.getVar('UBOOT_BINARIES', True)
+    ubootbinary = d.getVar('UBOOT_BINARY')
+    ubootbinaries = d.getVar('UBOOT_BINARIES')
     # The "doc" varflag is special, we don't want to see it here
     ubootconfigflags.pop('doc', None)
 
     if not ubootmachine and not ubootconfigflags:
-        PN = d.getVar("PN", True)
-        FILE = os.path.basename(d.getVar("FILE", True))
+        PN = d.getVar("PN")
+        FILE = os.path.basename(d.getVar("FILE"))
         bb.debug(1, "To build %s, see %s for instructions on \
                  setting up your machine config" % (PN, FILE))
-        raise bb.parse.SkipPackage("Either UBOOT_MACHINE or UBOOT_CONFIG must be set in the %s machine configuration." % d.getVar("MACHINE", True))
+        raise bb.parse.SkipPackage("Either UBOOT_MACHINE or UBOOT_CONFIG must be set in the %s machine configuration." % d.getVar("MACHINE"))
 
     if ubootmachine and ubootconfigflags:
         raise bb.parse.SkipPackage("You cannot use UBOOT_MACHINE and UBOOT_CONFIG at the same time.")
@@ -37,7 +37,7 @@
     if not ubootconfigflags:
         return
 
-    ubootconfig = (d.getVar('UBOOT_CONFIG', True) or "").split()
+    ubootconfig = (d.getVar('UBOOT_CONFIG') or "").split()
     if len(ubootconfig) > 0:
         for config in ubootconfig:
             for f, v in ubootconfigflags.items():