diff --git a/src/MCAnalyzer.jl b/src/MCAnalyzer.jl
index ed984a6..be3b4ec 100644
--- a/src/MCAnalyzer.jl
+++ b/src/MCAnalyzer.jl
@@ -175,10 +175,8 @@ Insert `iaca` and `llvm-mca` start markers at this position.
 """
 function mark_start()
     @asmcall("""
-    movl \$\$111, %ebx
-    .byte 0x64, 0x67, 0x90
     # LLVM-MCA-BEGIN
-    """, "~{memory},~{ebx}", true)
+    """, "~{memory}", true)
 end
 
 """
@@ -189,9 +187,7 @@ Insert `iaca` and `llvm-mca` end markers at this position.
 function mark_end()
     @asmcall("""
     # LLVM-MCA-END
-    movl \$\$222, %ebx
-    .byte 0x64, 0x67, 0x90
-    """, "~{memory},~{ebx}", true)
+    """, "~{memory}", true)
 end
 
 end # module