diff --git a/observation_sim/sim_steps/readout_output.py b/observation_sim/sim_steps/readout_output.py
index 8ef872fd6d9348f3f46491486010fa41af935c6f..c2cb8a16ab8054a55ad7456fa01987e5d42a8d34 100644
--- a/observation_sim/sim_steps/readout_output.py
+++ b/observation_sim/sim_steps/readout_output.py
@@ -86,10 +86,10 @@ def quantization_and_output(self, chip, filt, tel, pointing, catalog, obs_param)
     fname = os.path.join(self.chip_output.subdir,
                          self.h_prim['FILENAME'] + '.fits')
 
-    f_name_size = 68
-    if (len(self.h_prim['FILENAME']) > f_name_size):
-        self.updateHeaderInfo(header_flag='prim', keys=['FILENAME'], values=[
-                              self.h_prim['FILENAME'][0:f_name_size]])
+    # f_name_size = 68
+    # if (len(self.h_prim['FILENAME']) > f_name_size):
+    #     self.updateHeaderInfo(header_flag='prim', keys=['FILENAME'], values=[
+    #                           self.h_prim['FILENAME'][0:f_name_size]])
 
     hdu1 = fits.PrimaryHDU(header=self.h_prim)