diff --git a/data/bufr/bufr_data_files.txt b/data/bufr/bufr_data_files.txt
index 04a56d9d4..802536f26 100644
--- a/data/bufr/bufr_data_files.txt
+++ b/data/bufr/bufr_data_files.txt
@@ -146,3 +146,4 @@ delayed_repl_01.bufr
 israel_observations_2017041010.bufr
 goes16_nm.bufr
 aeolus_wmo_26.bufr
+ecc738.msg2.bufr
diff --git a/tests/bufr_json.sh b/tests/bufr_json.sh
index fb43ff714..b345913dd 100755
--- a/tests/bufr_json.sh
+++ b/tests/bufr_json.sh
@@ -11,6 +11,17 @@
 . ./include.sh
 
 REDIRECT=/dev/null
+cd ${data_dir}/bufr
+
+
+# ECC-738: MEMFS
+# ---------------------
+if [ $HAVE_MEMFS -eq 1 ]; then
+    unset ECCODES_DEFINITION_PATH
+    file=ecc738.msg2.bufr
+    ${tools_dir}/bufr_dump $file > $REDIRECT
+fi
+
 
 # Decide if we have the JSON verifier commandline utility
 JSON_VERIF="json_xs"
@@ -19,8 +30,6 @@ if command -v $JSON_VERIF >/dev/null 2>&1; then
   JSON_CHECK=$JSON_VERIF
 fi
 
-cd ${data_dir}/bufr
-
 bufr_files=`cat bufr_data_files.txt`
 for file in ${bufr_files}
 do