diff --git a/src/accessor/grib_accessor_class_g2end_step.cc b/src/accessor/grib_accessor_class_g2end_step.cc
index 7d3c2c225..78fdfb129 100644
--- a/src/accessor/grib_accessor_class_g2end_step.cc
+++ b/src/accessor/grib_accessor_class_g2end_step.cc
@@ -309,7 +309,7 @@ static int unpack_multiple_time_ranges_double_(grib_accessor* a, double* val, si
             long the_coded_unit       = arr_coded_unit[i];
             long the_coded_time_range = arr_coded_time_range[i];
 
-            eccodes::Step time_range{ the_coded_unit, the_coded_time_range };
+            eccodes::Step time_range{the_coded_time_range, the_coded_unit};
             *val = (start_step + time_range).value<double>(eccodes::Unit(step_units));
 
             return GRIB_SUCCESS;
diff --git a/tests/grib_sub_hourly.sh b/tests/grib_sub_hourly.sh
index a49a90a6a..0f543cb79 100755
--- a/tests/grib_sub_hourly.sh
+++ b/tests/grib_sub_hourly.sh
@@ -62,6 +62,11 @@ fi
 instantaneous_field=$data_dir/reduced_gaussian_surface.grib2
 accumulated_field=$data_dir/reduced_gaussian_sub_area.grib2
 
+# ECC-18XX: Bad step initialisatino
+${tools_dir}/grib_set -s productDefinitionTemplateNumber=11,forecastTime=2184,indicatorOfUnitForForecastTime=1,lengthOfTimeRange=720,indicatorOfUnitForTimeRange=1,typeOfTimeIncrement=2,numberOfTimeRange=2 $accumulated_field $temp
+${tools_dir}/grib_ls $temp
+grib_check_key_equals $temp "-p stepRange" "2184-2904"
+
 # ECC-1228: Changing template with negative forecast time
 ${tools_dir}/grib_set -s stepRange=-48s--24s $accumulated_field $temp
 ${tools_dir}/grib_set -s productDefinitionTemplateNumber=8 $temp $temp2