diff --git a/canvas/source/tools/prioritybooster.cxx b/canvas/source/tools/prioritybooster.cxx
index 628a9f2853a0..e5291359d099 100644
--- a/canvas/source/tools/prioritybooster.cxx
+++ b/canvas/source/tools/prioritybooster.cxx
@@ -68,7 +68,7 @@ namespace canvas
                             "PriorityBooster::PriorityBooster(): Was not able to modify thread priority" );
             }
 #else
-            nDelta = 0; // #i55991# placate gcc warning
+            (void)nDelta;
 #endif
         }