diff --git a/src/common/cpu.c b/src/common/cpu.c
index 16578543b..b55a5ab00 100644
--- a/src/common/cpu.c
+++ b/src/common/cpu.c
@@ -70,7 +70,7 @@ const unsigned CPUIsets[CPU_COUNT] = {
     CPU_ISET_NONE,
     CPU_ISET_6502,
     CPU_ISET_6502 | CPU_ISET_6502X,
-    CPU_ISET_6502 | CPU_ISET_6502X | CPU_ISET_6502DTV,
+    CPU_ISET_6502 | CPU_ISET_6502DTV,
     CPU_ISET_6502 | CPU_ISET_65SC02,
     CPU_ISET_6502 | CPU_ISET_65SC02 | CPU_ISET_65C02,
     CPU_ISET_6502 | CPU_ISET_65SC02 | CPU_ISET_65C02 | CPU_ISET_65816,
diff --git a/src/common/cpu.h b/src/common/cpu.h
index 706b4544e..2e75feaaf 100644
--- a/src/common/cpu.h
+++ b/src/common/cpu.h
@@ -50,7 +50,7 @@ typedef enum {
     CPU_NONE,                   /* No CPU - for assembler */
     CPU_6502,
     CPU_6502X,                  /* "Extended", that is: with illegal opcodes */
-    CPU_6502DTV,                /* CPU_6502X + C64DTV extra opcodes */
+    CPU_6502DTV,                /* CPU_6502 + DTV extra and illegal opcodes */
     CPU_65SC02,
     CPU_65C02,
     CPU_65816,