diff --git a/doc/source/config.rst b/doc/source/config.rst
index 9babc1abbf..1cbbbec2ed 100644
--- a/doc/source/config.rst
+++ b/doc/source/config.rst
@@ -272,7 +272,7 @@ If ``clip_negative_radiances=False``, pixels with negative radiances will have
 
 Clipping of negative radiances is currently implemented for the following readers:
 
-* ``abi_l1b``, ``ami_l1b``
+* ``abi_l1b``, ``ami_l1b``, ``fci_l1c_nc``
 
 
 Temporary Directory
diff --git a/satpy/readers/fci_l1c_nc.py b/satpy/readers/fci_l1c_nc.py
index caad045f90..c24c9b4849 100644
--- a/satpy/readers/fci_l1c_nc.py
+++ b/satpy/readers/fci_l1c_nc.py
@@ -685,7 +685,7 @@ def calibrate_counts_to_rad(self, data, key):
     def _clipneg(data):
         """Clip counts to avoid negative radiances."""
         lo = -data.attrs.get("add_offset", 0) // data.attrs.get("scale_factor", 1) + 1
-        return data.where(data>=lo, lo)
+        return data.where((~data.notnull())|(data>=lo), lo)
 
     def calibrate_rad_to_bt(self, radiance, key):
         """IR channel calibration."""