diff --git a/Aircraft/Instruments/trn-c172s.xml b/Aircraft/Instruments/trn-c172s.xml
index 73c8f2d8b..006bd299d 100644
--- a/Aircraft/Instruments/trn-c172s.xml
+++ b/Aircraft/Instruments/trn-c172s.xml
@@ -82,8 +82,8 @@ Jan 28 2003
    <name>ON</name>
    <condition>
     <greater-than-equals>
-     <property>/instrumentation/turn-indicator/spin</property>
-     <value>0.7</value>
+     <property>/systems/electrical/outputs/turn-coordinator</property>
+     <value>1.0</value>
     </greater-than-equals>
    </condition>
    <w>56</w>