diff --git a/mlprec/mlc2mlh.sh b/mlprec/mlc2mlh.sh
index 4687657d..6594ec19 100755
--- a/mlprec/mlc2mlh.sh
+++ b/mlprec/mlc2mlh.sh
@@ -2,6 +2,8 @@
 hn=mld_const.h
 fn=mld_base_prec_type.F90
 echo "/* This file was generated by a script using the $fn file as a basis. */" > $hn
+echo '#ifndef MLD_CONST_H_' >> $hn
+echo '#define MLD_CONST_H_' >> $hn
 echo '#ifdef __cplusplus' >> $hn
 echo 'extern "C" { ' >> $hn
 echo '#endif' >> $hn
@@ -9,5 +11,6 @@ cat $fn | sed 's/=/= (/g;s/$/ )/g' | grep '\(^  *!\)\|parameter' | grep  '_\>'
 echo '#ifdef __cplusplus' >> $hn
 echo '}' >> $hn
 echo '#endif' >> $hn
+echo '#endif' >> $hn
 exit
 
diff --git a/mlprec/mld_const.h b/mlprec/mld_const.h
index 2192a170..1195fefc 100644
--- a/mlprec/mld_const.h
+++ b/mlprec/mld_const.h
@@ -1,4 +1,6 @@
 /* This file was generated by a script using the mld_base_prec_type.F90 file as a basis. */
+#ifndef MLD_CONST_H_
+#define MLD_CONST_H_
 #ifdef __cplusplus
 extern "C" { 
 #endif
@@ -102,3 +104,4 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
+#endif