diff --git a/astro/Makefile b/astro/Makefile
index 0958fef5475..fefd36b76f0 100644
--- a/astro/Makefile
+++ b/astro/Makefile
@@ -1,5 +1,6 @@
      SUBDIR =
      SUBDIR += ansiweather
+     SUBDIR += calcmysky
      SUBDIR += celestia
      SUBDIR += dgpsip
      SUBDIR += gcal