diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4
index 819da8fc77e0ab2ff51e4279e96fc2c2f21a1aeb..8df6f9cc5a60e25884983061f7c7f0bcf00d9185 100644
--- a/m4/virt-compile-warnings.m4
+++ b/m4/virt-compile-warnings.m4
@@ -112,6 +112,7 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
         gl_WARN_ADD([-fexceptions])
         gl_WARN_ADD([-fasynchronous-unwind-tables])
         gl_WARN_ADD([-fdiagnostics-show-option])
+        gl_WARN_ADD([-funit-at-a-time])
 
         if test "$enable_compile_warnings" = "error"
         then