diff --git a/configure.ac b/configure.ac
index 5d370aaf..eb816c07 100644
--- a/configure.ac
+++ b/configure.ac
@@ -570,6 +570,7 @@ AC_SUBST([GRID_SUMMARY])
 AC_CONFIG_FILES([grid-config], [chmod +x grid-config])
 AC_CONFIG_FILES(Makefile)
 AC_CONFIG_FILES(Grid/Makefile)
+AC_CONFIG_FILES(HMC/Makefile)
 AC_CONFIG_FILES(tests/Makefile)
 AC_CONFIG_FILES(tests/IO/Makefile)
 AC_CONFIG_FILES(tests/core/Makefile)