diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 751dbc7a4..579922867 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -87,6 +87,7 @@ if( HAVE_BUILD_TOOLS )
         grib_ecc-1255
         grib_ecc-1258
         grib_ecc-1260
+        grib_ecc-1261
         bufr_ecc-1028
         bufr_ecc-1195
         bufr_ecc-1259
diff --git a/tests/grib_ecc-1261.sh b/tests/grib_ecc-1261.sh
new file mode 100755
index 000000000..3c4d4899e
--- /dev/null
+++ b/tests/grib_ecc-1261.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+# (C) Copyright 2005- ECMWF.
+#
+# This software is licensed under the terms of the Apache Licence Version 2.0
+# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
+# 
+# In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
+# virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
+#
+
+. ./include.sh
+set -u
+
+label="grib_ecc-1261-test"
+
+tempFilt="temp.${label}.filt"
+tempGrib="temp.${label}.grib"
+
+sample_grib1=$ECCODES_SAMPLES_PATH/GRIB1.tmpl
+sample_grib2=$ECCODES_SAMPLES_PATH/GRIB2.tmpl
+
+test_ld12()
+{
+    samplef=$1
+    itime=$2 # input indexingTime
+    otime=$3 # output (expected)
+
+    cat > $tempFilt << EOF
+      set setLocalDefinition=1;
+      set localDefinitionNumber=12;
+      set indexingTime = $itime;
+      write;
+EOF
+    ${tools_dir}/grib_filter -o $tempGrib $tempFilt $samplef
+    grib_check_key_equals $tempGrib "mars.time" "$otime"
+    rm -f $tempFilt $tempGrib
+}
+
+test_ld12 $sample_grib1 "0"    "0000"
+test_ld12 $sample_grib1 "12"   "0012"
+test_ld12 $sample_grib1 "2400" "2400"
+test_ld12 $sample_grib1 "1423" "1423"
+
+test_ld12 $sample_grib2 "0"    "0000"
+test_ld12 $sample_grib2 "12"   "0012"
+test_ld12 $sample_grib2 "2400" "2400"
+test_ld12 $sample_grib2 "1423" "1423"
+