--- a/m4/ax_boost_base.m4
+++ b/m4/ax_boost_base.m4
@@ -85,9 +85,6 @@
     succeeded=no
 
     libsubdir="lib"
-    if test "$(uname -m)" = "x86_64"; then
-        libsubdir="lib64"
-    fi
 
     dnl first we check the system location for boost libraries
     dnl this location ist chosen if boost libraries are installed with the --layout=system option