diff --git a/decoders/uart/pd.py b/decoders/uart/pd.py
index 537e0e58..fafe1f52 100644
--- a/decoders/uart/pd.py
+++ b/decoders/uart/pd.py
@@ -229,7 +229,7 @@ def start(self):
         self.bw = (self.options['data_bits'] + 7) // 8
         packet_idle_us = self.options['packet_idle_us']
         self.packet_idle_samples = int(round(packet_idle_us * 1e-6 * self.samplerate))
-        if not self.packet_idle_samples >= 0:
+        if not self.packet_idle_samples > 0:
             self.packet_idle_samples = None
 
     def metadata(self, key, value):