diff --git a/src/da65/opc6502.c b/src/da65/opc6502.c
index f3ea1dbcd..a91414ae4 100644
--- a/src/da65/opc6502.c
+++ b/src/da65/opc6502.c
@@ -259,7 +259,7 @@ const OpcDesc OpcTable_6502[256] = {
     {   "cmp",  2,  flUseLabel,               OH_DirectIndirectY       }, /* $d1 */
     {   "",     1,  flIllegal,                OH_Illegal,              }, /* $d2 */
     {   "",     1,  flIllegal,                OH_Illegal,              }, /* $d3 */
-    {   "pei",  2,  flUseLabel,               OH_Direct                }, /* $d4 */
+    {   "",     1,  flIllegal,                OH_Illegal,              }, /* $d4 */
     {   "cmp",  2,  flUseLabel,               OH_DirectX               }, /* $d5 */
     {   "dec",  2,  flUseLabel,               OH_DirectX               }, /* $d6 */
     {   "",     1,  flIllegal,                OH_Illegal,              }, /* $d7 */
diff --git a/src/da65/opc65c02.c b/src/da65/opc65c02.c
index 944f598b5..bb38405d5 100644
--- a/src/da65/opc65c02.c
+++ b/src/da65/opc65c02.c
@@ -259,7 +259,7 @@ const OpcDesc OpcTable_65C02[256] = {
     {   "cmp",  2,  flUseLabel,               OH_DirectIndirectY       }, /* $d1 */
     {   "cmp",  2,  flUseLabel,               OH_DirectIndirect        }, /* $d2 */
     {   "",     1,  flIllegal,                OH_Illegal,              }, /* $d3 */
-    {   "pei",  2,  flUseLabel,               OH_Direct                }, /* $d4 */
+    {   "",     1,  flIllegal,                OH_Illegal,              }, /* $d4 */
     {   "cmp",  2,  flUseLabel,               OH_DirectX               }, /* $d5 */
     {   "dec",  2,  flUseLabel,               OH_DirectX               }, /* $d6 */
     {   "smb5", 1,  flUseLabel,               OH_Direct,               }, /* $d7 */
diff --git a/src/da65/opc65sc02.c b/src/da65/opc65sc02.c
index 8b35b5cca..d5f71f664 100644
--- a/src/da65/opc65sc02.c
+++ b/src/da65/opc65sc02.c
@@ -32,7 +32,7 @@
 /*****************************************************************************/
 
 
-         
+
 /* da65 */
 #include "handler.h"
 #include "opc65sc02.h"
@@ -259,7 +259,7 @@ const OpcDesc OpcTable_65SC02[256] = {
     {   "cmp",  2,  flUseLabel,               OH_DirectIndirectY       }, /* $d1 */
     {   "cmp",  2,  flUseLabel,               OH_DirectIndirect        }, /* $d2 */
     {   "",     1,  flIllegal,                OH_Illegal,              }, /* $d3 */
-    {   "pei",  2,  flUseLabel,               OH_Direct                }, /* $d4 */
+    {   "",     1,  flIllegal,                OH_Illegal,              }, /* $d4 */
     {   "cmp",  2,  flUseLabel,               OH_DirectX               }, /* $d5 */
     {   "dec",  2,  flUseLabel,               OH_DirectX               }, /* $d6 */
     {   "",     1,  flIllegal,                OH_Illegal,              }, /* $d7 */