diff --git a/configure.ac b/configure.ac
index 1b8b729b4d48..1f9cdace5889 100644
--- a/configure.ac
+++ b/configure.ac
@@ -105,6 +105,15 @@ alpha*-unknown-freebsd*)
         HostVendor_CPP='unknown'
         HostOS_CPP='freebsd'
         ;;
+amd64*-unknown-openbsd*)
+	HostPlatform=amd64-unknown-openbsd
+	TargetPlatform=amd64-unknown-openbsd
+	BuildPlatform=amd64-unknown-openbsd
+        HostPlatform_CPP='amd64_unknown_openbsd'
+        HostArch_CPP='amd64'
+        HostVendor_CPP='unknown'
+        HostOS_CPP='openbsd'
+        ;;
 arm*-linux*)
         HostPlatform=arm-unknown-linux # hack again
         TargetPlatform=arm-unknown-linux