diff --git a/run_fastsurfer.sh b/run_fastsurfer.sh
index ebed4eb2..16cd5726 100755
--- a/run_fastsurfer.sh
+++ b/run_fastsurfer.sh
@@ -37,6 +37,7 @@ reconsurfdir="$FASTSURFER_HOME/recon_surf"
 
 # Regular flags defaults
 subject=""
+sd="$SUBJECTS_DIR"
 t1=""
 t2=""
 merged_segfile=""