diff --git a/CompileClient.md b/CompileClient.md
index 4db05e8..b307295 100644
--- a/CompileClient.md
+++ b/CompileClient.md
@@ -28,7 +28,7 @@ In this case you should build using:
 ```
 ./_autosetup
 ./configure --disable-server --enable-client-release --build=i686-pc-linux-gnu \
-    CXXFLAGS="-O3 -funroll-loops -fforce-addr -ffast-math"
+    CXXFLAGS="-march=x86-64 -O3 -ffast-math"
 make
 ```