diff --git a/src/65c02isa.csv b/src/65c02isa.csv
index b3599d0..86053d1 100644
--- a/src/65c02isa.csv
+++ b/src/65c02isa.csv
@@ -115,7 +115,7 @@ OP_BVS_REL,"bvs",RELATIVE,2,NULL
 OP_ADC_IZPY,"adc",IZPY,2,NULL
 OP_ADC_IZP,"adc",IZP,2,NULL
 OP_NOPI_74,"nop",IMPLIED,1,NULL
-OP_STZ_ZPX,"stz",ZPX,2,NULL
+OP_STZ_ZPX,"stz",ZPX,2,emul_stz
 OP_ADC_ZPX,"adc",ZPX,2,NULL
 OP_ROR_ZPX,"ror",ZPX,2,NULL
 OP_RMB7_ZP,"rmb7",ZP,2,NULL
@@ -155,9 +155,9 @@ OP_TYA,"tya",IMPLIED,1,NULL
 OP_STA_ABSY,"sta",ABSOLUTEY,3,NULL
 OP_TXS,"txs",IMPLIED,1,NULL
 OP_NOPI_9C,"nop",IMPLIED,1,NULL
-OP_STZ_ABS,"stz",ABSOLUTE,3,NULL
+OP_STZ_ABS,"stz",ABSOLUTE,3,emul_stz
 OP_STA_ABSX,"sta",ABSOLUTEX,3,NULL
-OP_STZ_ABSX,"stz",ABSOLUTEX,3,NULL
+OP_STZ_ABSX,"stz",ABSOLUTEX,3,emul_stz
 OP_BBS1_REL,"bbs1",ZPR,2,NULL
 OP_LDY_IMM,"ldy",IMMEDIATE,2,NULL
 OP_LDA_IZPX,"lda",IZPX,2,emul_lda