diff --git a/configure b/configure
index d199bd3d..fb5b5bea 100755
--- a/configure
+++ b/configure
@@ -6537,8 +6537,8 @@ if test "X$FCOPT" == "X" ; then
    FCOPT="-g -O3  $FCOPT"
  elif test "X$psblas_cv_fc" == X"xlf" ; then
    # XL compiler : consider using -qarch=auto
-     FCOPT="-O3 -qarch=auto  -qfixed -qsuffix=f=f:cpp=F -qlanglvl=extended $FCOPT"
-     FCFLAGS="-qhalt=e $FCFLAGS"
+     FCOPT="-O3 -qarch=auto  -qlanglvl=extended -qxlf2003=polymorphic:autorealloc $FCOPT"
+     FCFLAGS="-qhalt=e -qlanglvl=extended -qxlf2003=polymorphic:autorealloc $FCFLAGS"
  elif test "X$psblas_cv_fc" == X"ifc" ; then
    # other compilers ..
      FCOPT="-O3 $FCOPT"
diff --git a/configure.ac b/configure.ac
index aac56cea..d4b211e2 100755
--- a/configure.ac
+++ b/configure.ac
@@ -380,8 +380,8 @@ if test "X$FCOPT" == "X" ; then
    FCOPT="-g -O3  $FCOPT"
  elif test "X$psblas_cv_fc" == X"xlf" ; then
    # XL compiler : consider using -qarch=auto
-     FCOPT="-O3 -qarch=auto  -qfixed -qsuffix=f=f:cpp=F -qlanglvl=extended $FCOPT"
-     FCFLAGS="-qhalt=e $FCFLAGS"
+     FCOPT="-O3 -qarch=auto  -qlanglvl=extended -qxlf2003=polymorphic:autorealloc $FCOPT"
+     FCFLAGS="-qhalt=e -qlanglvl=extended -qxlf2003=polymorphic:autorealloc $FCFLAGS"
  elif test "X$psblas_cv_fc" == X"ifc" ; then
    # other compilers ..
      FCOPT="-O3 $FCOPT"