diff --git a/Makefile.am b/Makefile.am
index 1a8473f..4b132ce 100755
--- a/Makefile.am
+++ b/Makefile.am
@@ -46,7 +46,7 @@
 space := $(empty) $(empty)
 comma := ,
 
-CROSS_LANGS = @MAYBE_CPP@ @MAYBE_C_GLIB@ @MAYBE_JAVA@ @MAYBE_CSHARP@ @MAYBE_PYTHON@ @MAYBE_PY3@ @MAYBE_RUBY@ @MAYBE_HASKELL@ @MAYBE_PERL@ @MAYBE_PHP@ @MAYBE_GO@ @MAYBE_NODEJS@ @MAYBE_DART@ @MAYBE_ERLANG@ @MAYBE_LUA@
+CROSS_LANGS = @MAYBE_CPP@ @MAYBE_C_GLIB@ @MAYBE_D@ @MAYBE_JAVA@ @MAYBE_CSHARP@ @MAYBE_PYTHON@ @MAYBE_PY3@ @MAYBE_RUBY@ @MAYBE_HASKELL@ @MAYBE_PERL@ @MAYBE_PHP@ @MAYBE_GO@ @MAYBE_NODEJS@ @MAYBE_DART@ @MAYBE_ERLANG@ @MAYBE_LUA@
 CROSS_LANGS_COMMA_SEPARATED = $(subst $(space),$(comma),$(CROSS_LANGS))
 
 if WITH_PY3