diff --git a/fortran/acsite.m4 b/fortran/acsite.m4
index dd949c021f..b37a2adeed 100644
--- a/fortran/acsite.m4
+++ b/fortran/acsite.m4
@@ -249,7 +249,7 @@ done
 
 if test -n "$F9XMODFLAG"; then
   echo $F9XMODFLAG 1>&6
-  FFLAGS="$(F9XMODFLAG). $(F9XMODFLAG)../src $FFLAGS"
+  FFLAGS="$F9XMODFLAG. $F9XMODFLAG../src $FFLAGS"
 else
   echo unknown 1>&6
 fi