diff --git a/config/user-arch.m4 b/config/user-arch.m4
index 7a09cbfe2b..1ffa28b0eb 100644
--- a/config/user-arch.m4
+++ b/config/user-arch.m4
@@ -8,14 +8,14 @@ AC_DEFUN([ZFS_AC_CONFIG_USER_ARCH], [
         AC_MSG_RESULT([$TARGET_ARCH])
 
 	case $TARGET_ARCH in
-	i386|x86_64|powerpc)
+	i386|x86_64|powerpc64)
 		AC_SUBST([TARGET_ARCH])
 		AC_SUBST([TARGET_ARCH_DIR])
 		;;
 	*)
                 AC_MSG_ERROR([
 		*** Unsupported architecture $TARGET_ARCH
-		*** Available architectures: x86, x86_64, powerpc])
+		*** Available architectures: x86, x86_64, powerpc64])
 		;;
 	esac
 ])