diff --git a/apps/grgsm_scanner b/apps/grgsm_scanner
index bbda35d..169a9e5 100755
--- a/apps/grgsm_scanner
+++ b/apps/grgsm_scanner
@@ -76,7 +76,7 @@
             samp_rate_in=samp_rate,
         )
         self.gsm_control_channels_decoder_0 = grgsm.control_channels_decoder()
-        self.gsm_clock_offset_control_0 = grgsm.clock_offset_control(fc, samp_rate)
+        self.gsm_clock_offset_control_0 = grgsm.clock_offset_control(fc, samp_rate, osr=4)
         self.gsm_bcch_ccch_demapper_0 = grgsm.gsm_bcch_ccch_demapper(0)
 
         ##################################################