1 files changed, 1 insertions, 1 deletions

diff --git a/Make.sys b/Make.sys
index 06a19724d1b4..fd635ed0b207 100644
--- a/Make.sys
+++ b/Make.sys
@@ -22,7 +22,7 @@ CC     = gcc -g
 MATH   = -lm -lc
 
 FFLAGS = 
-FC     = gfortran -fdefault-double-8 -fdefault-real-8 -O2
+FC     = gfortran -std=legacy -fdefault-double-8 -fdefault-real-8 -O2
 
 #-------------------------------------------
 #debug options