diff --git a/configure.ac b/configure.ac
index 63e966792b08..65dd75e8eeb4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4209,7 +4209,7 @@ freebsd*)
         PLATFORMID=freebsd_x86
         OUTPATH=unxfbsdi
         ;;
-    x86_64)
+    x86_64|amd64)
         CPUNAME=X86_64
         RTL_ARCH=X86_64
         PLATFORMID=freebsd_x86_64