diff --git a/configure.ac b/configure.ac
index 92bc0471..4e1c0d24 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,7 +23,7 @@ AC_CONFIG_MACRO_DIR([m4])
 AC_ARG_VAR(DIST_LANG, [language to include in the distribution package (i.e., make dist)])
 case "$DIST_LANG" in
   "") DIST_LANG=all ;;
-  all | cpp | java | python | javanano | objectivec | ruby) ;;
+  all | cpp | csharp | java | python | javanano | objectivec | ruby) ;;
   *) AC_MSG_FAILURE([unknown language: $DIST_LANG]) ;;
 esac
 AC_SUBST(DIST_LANG)