diff --git a/plot_transmission_timeline.py b/plot_transmission_timeline.py
index 2429bbb..6160489 100755
--- a/plot_transmission_timeline.py
+++ b/plot_transmission_timeline.py
@@ -214,7 +214,7 @@ if __name__ == "__main__":
     par11.set_ylabel("CQI")
     par11.set_ylim([0, 15])
 
-    par12.plot(transmission_df["ach_rtt"], "-.", color="red", label="ACK RTT")
+    par12.plot(transmission_df["ack_rtt"], "-.", color="red", label="ACK RTT")
     par12.set_ylabel("ACK RTT [s]")
     par12.set_ylim([0, 5])