diff --git a/datafiles/xed-amd-snp.txt b/datafiles/xed-amd-snp.txt
index 7ec29523..11a2f23b 100644
--- a/datafiles/xed-amd-snp.txt
+++ b/datafiles/xed-amd-snp.txt
@@ -24,7 +24,7 @@ CATEGORY  : SYSTEM
 EXTENSION : SNP
 ATTRIBUTES: AMDONLY
 FLAGS     : MUST [ of-mod sf-mod zf-mod af-mod pf-mod ]
-PATTERN   : 0x0F 0x01 MOD[0b11] MOD=3 REG[0b111] RM[0b111] f3_refining_prefix
+PATTERN   : 0x0F 0x01 MOD[0b11] MOD=3 REG[0b111] RM[0b111] f3_refining_prefix mode64
 OPERANDS  : REG0=XED_REG_RAX:rw:IMPL
 }
 
@@ -36,7 +36,7 @@ CATEGORY  : SYSTEM
 EXTENSION : SNP
 ATTRIBUTES: AMDONLY
 FLAGS     : MUST [ of-mod sf-mod zf-mod af-mod pf-mod cf-mod ]
-PATTERN   : 0x0F 0x01 MOD[0b11] MOD=3 REG[0b111] RM[0b111] f2_refining_prefix
+PATTERN   : 0x0F 0x01 MOD[0b11] MOD=3 REG[0b111] RM[0b111] f2_refining_prefix mode64
 OPERANDS  : REG0=XED_REG_RAX:rw:IMPL REG1=XED_REG_ECX:r:IMPL REG2=XED_REG_EDX:r:IMPL
 }
 
@@ -48,7 +48,7 @@ CATEGORY  : SYSTEM
 EXTENSION : SNP
 ATTRIBUTES: AMDONLY
 FLAGS     : MUST [ of-mod sf-mod zf-mod af-mod pf-mod  ]
-PATTERN   : 0x0F 0x01 MOD[0b11] MOD=3 REG[0b111] RM[0b110] f3_refining_prefix
+PATTERN   : 0x0F 0x01 MOD[0b11] MOD=3 REG[0b111] RM[0b110] f3_refining_prefix mode64
 OPERANDS  : REG0=XED_REG_RAX:rw:IMPL REG1=XED_REG_RCX:r:IMPL REG2=XED_REG_RDX:r:IMPL
 }
 
@@ -59,6 +59,6 @@ CATEGORY  : SYSTEM
 EXTENSION : SNP
 ATTRIBUTES: AMDONLY
 FLAGS     : MUST [ of-mod sf-mod zf-mod af-mod pf-mod  ]
-PATTERN   : 0x0F 0x01 MOD[0b11] MOD=3 REG[0b111] RM[0b110] f2_refining_prefix
+PATTERN   : 0x0F 0x01 MOD[0b11] MOD=3 REG[0b111] RM[0b110] f2_refining_prefix mode64
 OPERANDS  : REG0=XED_REG_RAX:rw:IMPL REG1=XED_REG_RCX:r:IMPL 
 }