diff --git a/NuRadioReco/framework/base_trace.py b/NuRadioReco/framework/base_trace.py
index a67902ad2..de62d591a 100644
--- a/NuRadioReco/framework/base_trace.py
+++ b/NuRadioReco/framework/base_trace.py
@@ -336,11 +336,11 @@ def add_to_trace(self, channel):
         if t0_channel < t0_readout:
             i_start_readout = 0
             t_start_readout = t0_readout
-            i_start_channel = int((t0_readout-t0_channel) * sampling_rate_channel) + 1 # The first bin of channel inside readout
+            i_start_channel = int(np.ceil((t0_readout - t0_channel) * sampling_rate_channel)) # The first bin of channel inside readout
             t_start_channel = tt_channel[i_start_channel]
         # 3. Channel starts after readout window:
         elif t0_channel >= t0_readout:
-            i_start_readout = int((t0_channel-t0_readout) * sampling_rate_readout) # The bin of readout right before channel starts
+            i_start_readout = int(np.floor((t0_channel - t0_readout) * sampling_rate_readout)) # The bin of readout right before channel starts
             t_start_readout = tt_readout[i_start_readout]
             i_start_channel = 0
             t_start_channel = t0_channel
@@ -349,11 +349,11 @@ def add_to_trace(self, channel):
         if t1_channel >= t1_readout:
             i_end_readout = n_samples_readout - 1
             t_end_readout = t1_readout
-            i_end_channel = int((t1_readout - t0_channel) * sampling_rate_channel) + 1 # The bin of channel right after readout ends
+            i_end_channel = int(np.ceil((t1_readout - t0_channel) * sampling_rate_channel)) # The bin of channel right after readout ends
             t_end_channel = tt_channel[i_end_channel]
         # 5. Channel ends before readout window:
         elif t1_channel < t1_readout:
-            i_end_readout = int((t1_channel - t0_readout) * sampling_rate_readout) # The bin of readout right before channel ends
+            i_end_readout = int(np.floor((t1_channel - t0_readout) * sampling_rate_readout)) # The bin of readout right before channel ends
             t_end_readout = tt_readout[i_end_readout]
             i_end_channel = n_samples_channel - 1
             t_end_channel = t1_channel