diff --git a/Fireworks/Muons/interface/FWMuonBuilder.h b/Fireworks/Muons/interface/FWMuonBuilder.h
index a95079a65225d..acce259358ac3 100644
--- a/Fireworks/Muons/interface/FWMuonBuilder.h
+++ b/Fireworks/Muons/interface/FWMuonBuilder.h
@@ -17,7 +17,7 @@ class FWEventItem;
 class TEveElementList;
 class TEveTrackPropagator;
 class FWMagField;
-class FWPRoxyBuilderBase;
+class FWProxyBuilderBase;
 
 class FWMuonBuilder
 {