diff --git a/plugins/ruby/codegen.pl b/plugins/ruby/codegen.pl
index 9d76c6872..03017a0f5 100755
--- a/plugins/ruby/codegen.pl
+++ b/plugins/ruby/codegen.pl
@@ -698,6 +698,8 @@ sub sizeof {
             return 12;
         } elsif ($subtype eq 'df-flagarray') {
             return 8;
+        } elsif ($subtype eq 'df-static-flagarray') {
+            return $field->getAttribute('count');
         } elsif ($subtype eq 'df-array') {
             return 8;   # XXX 6 ?
         } else {
@@ -913,6 +915,7 @@ sub render_item_container {
     my $rbmethod = join('_', split('-', $subtype));
     my $tg = $item->findnodes('child::ld:item')->[0];
     my $indexenum = $item->getAttribute('index-enum');
+    my $count = $item->getAttribute('count');
     if ($tg)
     {
         if ($rbmethod eq 'df_linked_list') {
@@ -929,11 +932,19 @@ sub render_item_container {
     elsif ($indexenum)
     {
         $indexenum = rb_ucase($indexenum);
-        push @lines_rb, "$rbmethod($indexenum)";
+        if ($count) {
+            push @lines_rb, "$rbmethod($count, $indexenum)";
+        } else {
+            push @lines_rb, "$rbmethod($indexenum)";
+        }
     }
     else
     {
-        push @lines_rb, "$rbmethod";
+        if ($count) {
+            push @lines_rb, "$rbmethod($count)";
+        } else {
+            push @lines_rb, "$rbmethod";
+        }
     }
 }
 
diff --git a/plugins/ruby/ruby-autogen-defs.rb b/plugins/ruby/ruby-autogen-defs.rb
index e657962d5..ffd68bf1e 100644
--- a/plugins/ruby/ruby-autogen-defs.rb
+++ b/plugins/ruby/ruby-autogen-defs.rb
@@ -78,6 +78,9 @@ module DFHack
                 def df_flagarray(indexenum=nil)
                     DfFlagarray.new(indexenum)
                 end
+                def df_static_flagarray(len, indexenum=nil)
+                    DfStaticFlagarray.new(len, indexenum)
+                end
                 def df_array(tglen)
                     DfArray.new(tglen, yield)
                 end
@@ -680,6 +683,48 @@ module DFHack
 
             include Enumerable
         end
+        class DfStaticFlagarray < MemStruct
+            attr_accessor :_indexenum
+            def initialize(len, indexenum)
+                @len = len*8
+                @_indexenum = indexenum
+            end
+            def length
+                @len
+            end
+            def size ; length ; end
+            def [](idx)
+                idx = _indexenum.int(idx) if _indexenum
+                idx += length if idx < 0
+                return if idx < 0 or idx >= length
+                byte = DFHack.memory_read_int8(@_memaddr + idx/8)
+                (byte & (1 << (idx%8))) > 0
+            end
+            def []=(idx, v)
+                idx = _indexenum.int(idx) if _indexenum
+                idx += length if idx < 0
+                if idx >= length or idx < 0
+                    raise 'index out of bounds'
+                else
+                    byte = DFHack.memory_read_int8(@_memaddr + idx/8)
+                    if (v == nil or v == false or v == 0)
+                        byte &= 0xff ^ (1 << (idx%8))
+                    else
+                        byte |= (1 << (idx%8))
+                    end
+                    DFHack.memory_write_int8(@_memaddr + idx/8, byte)
+                end
+            end
+            def inspect
+                out = "#<DfStaticFlagarray"
+                each_with_index { |e, idx|
+                    out << " #{_indexenum.sym(idx)}" if e
+                }
+                out << '>'
+            end
+
+            include Enumerable
+        end
         class DfArray < Compound
             attr_accessor :_tglen, :_tg
             def initialize(tglen, tg)