diff --git a/base/compiler/typelimits.jl b/base/compiler/typelimits.jl
index f8220375e4518f..2af7e173236b64 100644
--- a/base/compiler/typelimits.jl
+++ b/base/compiler/typelimits.jl
@@ -4,7 +4,7 @@
 # limitation parameters #
 #########################
 
-const MAX_TYPEUNION_COMPLEXITY = 3
+const MAX_TYPEUNION_COMPLEXITY = 2
 const MAX_INLINE_CONST_SIZE = 256
 
 #########################