diff --git a/lib/x86-mes/x86.M1 b/lib/x86-mes/x86.M1
index 005a44dc..efceaaa9 100644
--- a/lib/x86-mes/x86.M1
+++ b/lib/x86-mes/x86.M1
@@ -136,7 +136,6 @@ DEFINE movswl_%bx,%ebx 0fbfdb
 DEFINE movw___%ax,0x32 66a3
 DEFINE movzbl_%al,%eax 0fb6c0
 DEFINE movzbl_%bl,%ebx 0fb6db
-DEFINE movzbl_%bl,%ebx 0fb6db
 DEFINE movzbl_(%eax),%eax 0fb600
 DEFINE movzbl_(%ebx),%ebx 0fb61b
 DEFINE movzbl_0x32(%eax),%eax 0fb680
@@ -203,7 +202,6 @@ DEFINE test___%eax,%eax 85c0
 DEFINE test___%ebx,%ebx 85db
 DEFINE xchg___%eax,%ebx 93
 DEFINE xchg___%eax,(%esp) 870424
-DEFINE xchg___%eax,(%esp) 870424
 DEFINE xchg___%ebx,(%esp) 871c24
 DEFINE xor____$i32,%eax 35
 DEFINE xor____$i8,%ah 80f4
diff --git a/lib/x86_64-mes/x86_64.M1 b/lib/x86_64-mes/x86_64.M1
index 364adb7d..32db5452 100644
--- a/lib/x86_64-mes/x86_64.M1
+++ b/lib/x86_64-mes/x86_64.M1
@@ -78,8 +78,6 @@ DEFINE mov____$i32,%rax 48c7c0
 DEFINE mov____$i32,%rdi 48c7c7
 DEFINE mov____$i32,0x8(%rbp) c745
 DEFINE mov____$i64,%r15 49bf
-DEFINE mov____$i64,%rax 48a1
-DEFINE mov____$i64,%rax 48b8
 DEFINE mov____$i64,%rax 48b8
 DEFINE mov____$i64,%rdi 48bf
 DEFINE mov____%al,(%rdi) 8807
@@ -92,7 +90,6 @@ DEFINE mov____%eax,%rax 89c0
 DEFINE mov____%eax,(%rdi) 8907
 DEFINE mov____%eax,0x32(%rbp)  8985
 DEFINE mov____%eax,0x8(%rbp) 8945
-DEFINE mov____%eax,0x8(%rbp) 8945
 DEFINE mov____%edi,%edi 89ff
 DEFINE mov____%edi,%rdi 89ff
 DEFINE mov____%edi,0x32(%rbp) 89bd