diff --git a/mach/proto/mcg/treebuilder.c b/mach/proto/mcg/treebuilder.c
index a48f59e9c..12aa5c2da 100644
--- a/mach/proto/mcg/treebuilder.c
+++ b/mach/proto/mcg/treebuilder.c
@@ -302,6 +302,7 @@ static void insn_simple(int opcode)
                     new_labelir(".trp")
                 )
             );
+            break;
         }
 
         case op_lni: