diff --git a/core/vm/errors.go b/core/vm/errors.go
index f6b156a02e383b5a09030b7967be3eea5d6b1747..c813aa36af369a356b8f0f1c12cae4fd761881ad 100644
--- a/core/vm/errors.go
+++ b/core/vm/errors.go
@@ -23,9 +23,6 @@ import (
 
 // List evm execution errors
 var (
-	// ErrInvalidSubroutineEntry means that a BEGINSUB was reached via iteration,
-	// as opposed to from a JUMPSUB instruction
-	ErrInvalidSubroutineEntry   = errors.New("invalid subroutine entry")
 	ErrOutOfGas                 = errors.New("out of gas")
 	ErrCodeStoreOutOfGas        = errors.New("contract creation code storage out of gas")
 	ErrDepth                    = errors.New("max call depth exceeded")
@@ -37,8 +34,6 @@ var (
 	ErrWriteProtection          = errors.New("write protection")
 	ErrReturnDataOutOfBounds    = errors.New("return data out of bounds")
 	ErrGasUintOverflow          = errors.New("gas uint64 overflow")
-	ErrInvalidRetsub            = errors.New("invalid retsub")
-	ErrReturnStackExceeded      = errors.New("return stack limit reached")
 )
 
 // ErrStackUnderflow wraps an evm error when the items on the stack less