diff --git a/thirdparty/heasarc/cfitsio/configure.ac b/thirdparty/heasarc/cfitsio/configure.ac
index 329d8ba115e..7072f88db3f 100644
--- a/thirdparty/heasarc/cfitsio/configure.ac
+++ b/thirdparty/heasarc/cfitsio/configure.ac
@@ -3,7 +3,7 @@ AC_REVISION($Revision$)
 
 dnl    Initialisation: package name and version number
 AC_INIT([cfitsio],[3.36],[starlink@jiscmail.ac.uk])
-AC_CONFIG_AUX_DIR([build-aux])
+AC_CONFIG_AUX_DIR([.])
 
 dnl    Require autoconf-2.50 at least
 AC_PREREQ([2.69])