diff --git a/config.h.in b/config.h.in
index 423fcf8f0..d857d0071 100755
--- a/config.h.in
+++ b/config.h.in
@@ -30,6 +30,9 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
+/* Define to add underscore after fortran functions */
+#undef LAPACK_FTN_TRAILING_UNDERSCORE
+
 /* Define to the sub-directory in which libtool stores uninstalled libraries.
    */
 #undef LT_OBJDIR
diff --git a/configure.ac b/configure.ac
index 33a282ecc..194cea0d6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,6 +27,10 @@ AC_SUBST([PACKAGE_DESCRIPTION])
 PACKAGE_URL="http://code.google.com/p/cantera/"
 AC_SUBST([PACKAGE_URL])
 
+# add trailing underscore
+AC_DEFINE([LAPACK_FTN_TRAILING_UNDERSCORE],1,[Define to add underscore after fortran functions])
+LAPACK_FTN_TRAILING_UNDERSCORE=1
+
 # ------------------------------
 # Checks for required programs
 # ------------------------------