diff --git a/Aircraft/c172p/c172-sound.xml b/Aircraft/c172p/c172-sound.xml
index 0c1644985..c0d365e4b 100644
--- a/Aircraft/c172p/c172-sound.xml
+++ b/Aircraft/c172p/c172-sound.xml
@@ -119,7 +119,7 @@
     <z>-1.5</z>
    </position>
    <volume>
-    <property>velocities/airspeed-kt</property>
+    <property>velocities/groundspeed-kt</property>
     <type>log</type>
     <factor>0.25</factor>
    </volume>
@@ -177,7 +177,7 @@
     <max>1.0</max>
    </volume>
    <pitch>
-    <property>velocities/airspeed-kt</property>
+    <property>velocities/groundspeed-kt</property>
     <factor>0.0025</factor>
     <offset>1.2</offset>
    </pitch>