diff --git a/src/Perl6/Metamodel/BUILDPLAN.nqp b/src/Perl6/Metamodel/BUILDPLAN.nqp
index 8e6bf16f5a1..bb3ab786e1e 100644
--- a/src/Perl6/Metamodel/BUILDPLAN.nqp
+++ b/src/Perl6/Metamodel/BUILDPLAN.nqp
@@ -18,7 +18,7 @@ role Perl6::Metamodel::BUILDPLAN {
     #    2 class name attr_name = set a native num attribute from init hash
     #    3 class name attr_name = set a native str attribute from init hash
     #    4 class attr_name code = call default value closure if needed
-    #    5 class attr_name code = call default value closure if needed, int attr
+    #    5 class attr_name code = call default value closure if needed, int or uint attr
     #    6 class attr_name code = call default value closure if needed, num attr
     #    7 class attr_name code = call default value closure if needed, str attr
     #    8 die if a required attribute is not present
@@ -31,6 +31,7 @@ role Perl6::Metamodel::BUILDPLAN {
     #   15 die if a required int attribute is 0
     #   16 die if a required num attribute is 0e0
     #   17 die if a required str attribute is null_s (will be '' in the future)
+    #   24 die if a required uint attribute is 0
     method create_BUILDPLAN($obj) {
         # First, we'll create the build plan for just this class.
         my @plan;
@@ -138,7 +139,7 @@ role Perl6::Metamodel::BUILDPLAN {
             if nqp::can($_, 'required') && $_.required {
                 my $type := $_.type;
                 my int $primspec := nqp::objprimspec($type);
-                my int $op := $primspec ?? 14 + $primspec !! 8;
+                my int $op := $primspec ?? $primspec == 10 ?? 24 !! 14 + $primspec !! 8;
                 nqp::push(@plan,[$op, $obj, $_.name, $_.required]);
                 nqp::deletekey(%attrs_untouched, $_.name);
             }
@@ -159,7 +160,7 @@ role Perl6::Metamodel::BUILDPLAN {
             # compile check constants for correct type
             if nqp::isconcrete($default) {
                 my $name   := $_.name;
-                my $opcode := $primspec || !$_.is_bound ?? 4 + $primspec !! 14;
+                my $opcode := $primspec || !$_.is_bound ?? $primspec == 10 ?? 5 !! 4 + $primspec !! 14;
                 my @action := [$opcode, $obj, $name, $default];
 
                 # binding defaults to additional check at runtime
diff --git a/src/Perl6/World.nqp b/src/Perl6/World.nqp
index f66c187a124..30d3cbd6a88 100644
--- a/src/Perl6/World.nqp
+++ b/src/Perl6/World.nqp
@@ -3895,7 +3895,7 @@ class Perl6::World is HLL::World {
                         # 15 = die if int is 0
                         # 16 = die if num is 0e0
                         # 17 = die if str is null_s
-                        elsif $code == 8 || $code >= 15 && $code <= 17 {
+                        elsif $code == 8 || $code >= 15 && $code <= 17 || $code == 24 {
 # nqp::unless(
 #   nqp::p6attrinited(nqp::getattr(self,Foo,'$!a')),
 #   X::Attribute::Required.new(name => '$!a', why => (value))
@@ -3920,6 +3920,11 @@ class Perl6::World is HLL::World {
                                   )
                                 );
                             }
+                            elsif $code == 24 {
+                                $check := QAST::Op.new( :op<getattr_u>,
+                                  $!self, $class, $attr
+                                );
+                            }
                             else {
                                 $check := QAST::Op.new( :op<p6attrinited>,
                                   QAST::Op.new( :op<getattr>,
diff --git a/tools/templates/NQP_REVISION b/tools/templates/NQP_REVISION
index 2390b4f3cd7..1fa762499e1 100644
--- a/tools/templates/NQP_REVISION
+++ b/tools/templates/NQP_REVISION
@@ -1 +1 @@
-2021.12-34-g7a93ff143
+2021.12-37-gc743974ec