diff --git a/grc/receiver/gsm_clock_offset_control.xml b/grc/receiver/gsm_clock_offset_control.xml
index e02ecf2..1b6fe30 100644
--- a/grc/receiver/gsm_clock_offset_control.xml
+++ b/grc/receiver/gsm_clock_offset_control.xml
@@ -3,7 +3,7 @@
   <name>GSM clock offset control</name>
   <key>gsm_clock_offset_control</key>
   <import>import gsm</import>
-  <make>gsm.clock_offset_control($fc, $samp_rate)</make>
+  <make>gsm.clock_offset_control($fc)</make>
   <callback></callback>
   <param>
     <name>fc</name>
@@ -12,13 +12,6 @@
     <type>float</type>
   </param>
 
-  <param>
-    <name>samp_rate</name>
-    <key>samp_rate</key>
-    <value>samp_rate</value>
-    <type>float</type>
-  </param>
-
   <sink>
     <name>measurements</name>
     <type>message</type>