diff --git a/.zenodo.json b/.zenodo.json
index df7a49977d..bb00d5471d 100644
--- a/.zenodo.json
+++ b/.zenodo.json
@@ -200,6 +200,10 @@
             "affiliation": "BSC, Spain",
             "name": "Martin-Martinez, Eneko",
             "orcid": "0000-0002-9213-7818"
+        },
+        {
+            "affiliation": "DLR, Germany",
+            "name": "Cammarano, Diego"
         }
     ],
     "description": "ESMValCore: A community tool for pre-processing data from Earth system models in CMIP and running analysis scripts.",
diff --git a/CITATION.cff b/CITATION.cff
index d188af5d39..b7c116e3e5 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -204,6 +204,10 @@ authors:
     family-names: Martin-Martinez
     given-names: Eneko
     orcid: "https://orcid.org/0000-0002-9213-7818"
+  -
+    affiliation: "DLR, Germany"
+    family-names: Cammarano
+    given-names: Diego
 
 cff-version: 1.2.0
 date-released: 2023-12-19
diff --git a/esmvalcore/cmor/_fixes/icon/_base_fixes.py b/esmvalcore/cmor/_fixes/icon/_base_fixes.py
index 94ada2e25b..2fcdbeaf3d 100644
--- a/esmvalcore/cmor/_fixes/icon/_base_fixes.py
+++ b/esmvalcore/cmor/_fixes/icon/_base_fixes.py
@@ -462,3 +462,12 @@ def _set_range_in_0_360(lon_coord):
         lon_coord.points = (lon_coord.core_points() + 360.0) % 360.0
         if lon_coord.has_bounds():
             lon_coord.bounds = (lon_coord.core_bounds() + 360.0) % 360.0
+
+
+class NegateData(IconFix):
+    """Base fix to negate data."""
+
+    def fix_data(self, cube):
+        """Fix data."""
+        cube.data = -cube.core_data()
+        return cube
diff --git a/esmvalcore/cmor/_fixes/icon/icon.py b/esmvalcore/cmor/_fixes/icon/icon.py
index 2e1dfd3bb3..39562b5db1 100644
--- a/esmvalcore/cmor/_fixes/icon/icon.py
+++ b/esmvalcore/cmor/_fixes/icon/icon.py
@@ -15,7 +15,7 @@
 
 from esmvalcore.iris_helpers import add_leading_dim_to_cube, date2num
 
-from ._base_fixes import IconFix
+from ._base_fixes import IconFix, NegateData
 
 logger = logging.getLogger(__name__)
 
@@ -512,3 +512,9 @@ def fix_metadata(self, cubes):
         )
         cube.var_name = self.vardef.short_name
         return CubeList([cube])
+
+
+Hfls = NegateData
+
+
+Hfss = NegateData
diff --git a/tests/integration/cmor/_fixes/icon/test_icon.py b/tests/integration/cmor/_fixes/icon/test_icon.py
index ab823cb846..4f9f4c4c02 100644
--- a/tests/integration/cmor/_fixes/icon/test_icon.py
+++ b/tests/integration/cmor/_fixes/icon/test_icon.py
@@ -14,7 +14,7 @@
 import esmvalcore.cmor._fixes.icon.icon
 from esmvalcore.cmor._fixes.fix import GenericFix
 from esmvalcore.cmor._fixes.icon._base_fixes import IconFix
-from esmvalcore.cmor._fixes.icon.icon import AllVars, Clwvi
+from esmvalcore.cmor._fixes.icon.icon import AllVars, Clwvi, Hfls, Hfss
 from esmvalcore.cmor.fix import Fix
 from esmvalcore.cmor.table import CoordinateInfo, get_var_info
 from esmvalcore.config import CFG
@@ -147,6 +147,15 @@ def fix_metadata(cubes, mip, short_name, session=None):
     return cubes
 
 
+def fix_data(cube, mip, short_name, session=None):
+    """Fix data of cube."""
+    fix = get_fix(mip, short_name, session=session)
+    cube = fix.fix_data(cube)
+    fix = get_allvars_fix(mip, short_name, session=session)
+    cube = fix.fix_data(cube)
+    return cube
+
+
 def check_ta_metadata(cubes):
     """Check ta metadata."""
     assert len(cubes) == 1
@@ -2209,3 +2218,63 @@ def test_fix_height_alt16(bounds, simple_unstructured_cube):
         np.testing.assert_allclose(alt16.bounds, expected_bnds)
     else:
         assert alt16.bounds is None
+
+
+# Test hfls (for extra fix)
+
+
+def test_get_hfls_fix():
+    """Test getting of fix."""
+    fix = Fix.get_fixes('ICON', 'ICON', 'Amon', 'hfls')
+    assert fix == [Hfls(None), AllVars(None), GenericFix(None)]
+
+
+def test_hfls_fix(cubes_regular_grid):
+    """Test fix."""
+    cubes = CubeList([cubes_regular_grid[0].copy()])
+    cubes[0].var_name = 'hfls'
+    cubes[0].units = 'W m-2'
+
+    fixed_cubes = fix_metadata(cubes, 'Amon', 'hfls')
+
+    assert len(fixed_cubes) == 1
+    cube = fixed_cubes[0]
+    assert cube.var_name == 'hfls'
+    assert cube.standard_name == 'surface_upward_latent_heat_flux'
+    assert cube.long_name == 'Surface Upward Latent Heat Flux'
+    assert cube.units == 'W m-2'
+    assert cube.attributes['positive'] == 'up'
+
+    fixed_cube = fix_data(cube, 'Amon', 'hfls')
+
+    np.testing.assert_allclose(fixed_cube.data, [[[0.0, -1.0], [-2.0, -3.0]]])
+
+
+# Test hfss (for extra fix)
+
+
+def test_get_hfss_fix():
+    """Test getting of fix."""
+    fix = Fix.get_fixes('ICON', 'ICON', 'Amon', 'hfss')
+    assert fix == [Hfss(None), AllVars(None), GenericFix(None)]
+
+
+def test_hfss_fix(cubes_regular_grid):
+    """Test fix."""
+    cubes = CubeList([cubes_regular_grid[0].copy()])
+    cubes[0].var_name = 'hfss'
+    cubes[0].units = 'W m-2'
+
+    fixed_cubes = fix_metadata(cubes, 'Amon', 'hfss')
+
+    assert len(fixed_cubes) == 1
+    cube = fixed_cubes[0]
+    assert cube.var_name == 'hfss'
+    assert cube.standard_name == 'surface_upward_sensible_heat_flux'
+    assert cube.long_name == 'Surface Upward Sensible Heat Flux'
+    assert cube.units == 'W m-2'
+    assert cube.attributes['positive'] == 'up'
+
+    fixed_cube = fix_data(cube, 'Amon', 'hfss')
+
+    np.testing.assert_allclose(fixed_cube.data, [[[0.0, -1.0], [-2.0, -3.0]]])