diff --git a/x86/gen.go b/x86/gen.go
index 2345cab..25d15fa 100644
--- a/x86/gen.go
+++ b/x86/gen.go
@@ -1,8 +1,4 @@
 package x86
 
-import "errors"
-
-var ErrBadOperandTypes = errors.New("bad operand types")
-
 //go:generate avogen -output zctors.go ctors
 //go:generate avogen -output zctors_test.go ctorstest