diff --git a/src/QAST/Operations.nqp b/src/QAST/Operations.nqp
index 326dc93e50..d67e5261a8 100644
--- a/src/QAST/Operations.nqp
+++ b/src/QAST/Operations.nqp
@@ -127,6 +127,22 @@ QAST::Operations.add_core_op('list', -> $qastcomp, $op {
     $ops
 });
 
+QAST::Operations.add_core_op('list_i', -> $qastcomp, $op {
+    # Create register for the resulting list and make an empty one.
+    my $list_reg := $*REGALLOC.fresh_p();
+    my $ops := $qastcomp.post_new('Ops', :result($list_reg));
+    $ops.push_pirop('new', $list_reg, "'ResizableIntegerArray'");
+
+    # Push all the things.
+    for $op.list {
+        my $post := $qastcomp.coerce($qastcomp.as_post($_), 'i');
+        $ops.push($post);
+        $ops.push_pirop('push', $list_reg, $post.result);
+    }
+
+    $ops
+});
+
 QAST::Operations.add_core_op('hash', -> $qastcomp, $op {
     # Create register for the resulting hash and make an empty one.
     my $hash_reg := $*REGALLOC.fresh_p();
@@ -335,8 +351,11 @@ sub handle_arg($arg, $qastcomp, $ops, @arg_results) {
     my $arg_post := $qastcomp.as_post($arg);
     $ops.push($arg_post);
     my $result := $arg_post.result;
-    if $arg.named -> $name {
-        $result := $result ~ " :named(" ~ $qastcomp.escape($name) ~ ")";
+    if $arg.flat {
+        $result := "$result :flat";
+    }
+    elsif $arg.named -> $name {
+        $result := "$result :named(" ~ $qastcomp.escape($name) ~ ")";
     }
     @arg_results.push($result);
 }
diff --git a/t/qast/qast.t b/t/qast/qast.t
index d0e2b6d60f..ed7b95437c 100644
--- a/t/qast/qast.t
+++ b/t/qast/qast.t
@@ -815,3 +815,29 @@ is_qast(
         'call to block with slurpy parameter works');
 }
 
+{
+    my $third := QAST::Block.new(
+        QAST::Var.new( :name('a'), :scope('local'), :decl('param') ),
+        QAST::Var.new( :name('b'), :scope('local'), :decl('param') ),
+        QAST::Var.new( :name('c'), :scope('local'), :decl('param') ),
+        QAST::Var.new( :name('c'), :scope('local') ),
+    );
+
+    is_qast(
+        QAST::Block.new(
+            $third,
+            QAST::Op.new(
+                :op('call'),
+                QAST::BVal.new( :value($third) ),
+                QAST::Op.new(
+                    :op('list_i'),
+                    QAST::IVal.new( :value(40) ),
+                    QAST::IVal.new( :value(41) ),
+                    QAST::IVal.new( :value(42) ),
+                    :flat,
+                )
+            )
+        ),
+        42,
+        'call with flattened argument works');
+}