diff --git a/configure.ac b/configure.ac
index 62b0d69..38910fd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -46,6 +46,10 @@ case $target in
     have_x86=true
     have_x86_64=true
     ;;
+  amd64-*-*)
+    have_x86=true
+    have_x86_64=true
+    ;;
 esac
 
 PTHREAD_FLAGS="-pthread"