diff --git a/input_prep/make_ss.sh b/input_prep/make_ss.sh
index 2ddc214..7ae0009 100755
--- a/input_prep/make_ss.sh
+++ b/input_prep/make_ss.sh
@@ -1,7 +1,9 @@
 #!/bin/bash
 # From: https://github.com/RosettaCommons/RoseTTAFold
 
-export BLASTMAT=$PIPE_DIR/blast-2.2.26/data/
+if [ -z  "${BLASTMAT}" ]; then
+    export BLASTMAT=$PIPE_DIR/blast-2.2.26/data/
+fi
 
 DATADIR="$CONDA_PREFIX/share/psipred_4.01/data"
 echo $DATADIR