diff --git a/js/src/jsinterp.cpp b/js/src/jsinterp.cpp
index 1bb82486a3d6..41b77e81b332 100644
--- a/js/src/jsinterp.cpp
+++ b/js/src/jsinterp.cpp
@@ -6768,7 +6768,6 @@ js_Interpret(JSContext *cx)
           L_JSOP_DEFXMLNS:
 # endif
 
-          L_JSOP_UNUSED78:
           L_JSOP_UNUSED79:
           L_JSOP_UNUSED103:
           L_JSOP_UNUSED131: