diff --git a/lib/asn1/der.h b/lib/asn1/der.h
index 3243fbe32..cef92aa07 100644
--- a/lib/asn1/der.h
+++ b/lib/asn1/der.h
@@ -94,12 +94,6 @@ typedef struct heim_ber_time_t {
     int bt_zone;
 } heim_ber_time_t;
 
-struct heim_acode {
-    size_t size;
-    unsigned int op;
-    void *arg1;
-};
-
 #include <der-protos.h>
 
 int _heim_fix_dce(size_t reallen, size_t *len);