diff --git a/tests/bufr_ecc-680.sh b/tests/bufr_ecc-680.sh
index 6669c030e..e4faece01 100755
--- a/tests/bufr_ecc-680.sh
+++ b/tests/bufr_ecc-680.sh
@@ -91,6 +91,19 @@ set -e
 fgrep -q "number of overridden reference values (2) different from number of descriptors between operator 203YYY and 203255" $tempText
 
 
+# No overridden ref vals provided
+cat > $tempFilt <<EOF
+  set unexpandedDescriptors = { 203014, 7030, 203255, 307080, 203000, 7030 };
+EOF
+set +e
+${tools_dir}/codes_bufr_filter -o $tempBufr $tempFilt $sample_bufr4 > $tempText 2>&1
+status=$?
+set -e
+[ $status -ne 0 ]
+fgrep -q "Overridden Reference Values array is empty" $tempText
+
+
+# Ref val too large
 cat > $tempFilt <<EOF
   set inputOverriddenReferenceValues = { -50000000 }; # Value too large
   set unexpandedDescriptors = { 203014, 7030, 203255, 307080, 203000, 7030 };
diff --git a/tests/bufr_filter_fail.sh b/tests/bufr_filter_fail.sh
index 3f1dd0370..c77654e45 100755
--- a/tests/bufr_filter_fail.sh
+++ b/tests/bufr_filter_fail.sh
@@ -109,7 +109,7 @@ grep -q "Input output problem" $tempErr
 # Test: with invalid operator
 #-----------------------------------------------------------
 cat > $fRules <<EOF
- set unexpandedDescriptors={ 285000, 1001 };
+ set unexpandedDescriptors={ 263000, 1001 };
  set pack=1;
  write;
 EOF
@@ -120,7 +120,7 @@ ${tools_dir}/codes_bufr_filter $fRules $f 2>> $fLog 1>> $fLog
 status=$?
 set -e
 [ $status -ne 0 ]
-grep -q "unsupported operator" $fLog
+grep -q "unsupported operator 63" $fLog
 
 
 # ------------------------