diff --git a/NON-APPROVED/COMMON/DEVICES/vacuum/diagnostics/vac_vpsu.bob b/NON-APPROVED/COMMON/DEVICES/vacuum/diagnostics/vac_vpsu.bob
index d0f727718b359a0bfe4d2f08696fd3f9eddcd95a..c09b207be2865fb9532f9786dc2e0130f65096ab 100644
--- a/NON-APPROVED/COMMON/DEVICES/vacuum/diagnostics/vac_vpsu.bob
+++ b/NON-APPROVED/COMMON/DEVICES/vacuum/diagnostics/vac_vpsu.bob
@@ -36,7 +36,7 @@
     <transparent>false</transparent>
     <horizontal_alignment>1</horizontal_alignment>
     <vertical_alignment>1</vertical_alignment>
-    <tooltip>$(plcioPREFIX)</tooltip>
+    <tooltip>$(psuPREFIX)</tooltip>
   </widget>
   <widget type="led" version="2.0.0">
     <name>ITLckTrigR</name>