diff --git a/ares/m4/cares-compilers.m4 b/ares/m4/cares-compilers.m4
index 68f47efd87386d138930dfc70ad08c840944bdaf..715c31eb8abd66b97d3e66f4c4f5b1d2366aa8d9 100644
--- a/ares/m4/cares-compilers.m4
+++ b/ares/m4/cares-compilers.m4
@@ -1150,8 +1150,7 @@ AC_DEFUN([CARES_CHECK_CURLDEBUG], [
   if test "$want_curldebug" = "yes"; then
     dnl TODO: Verify if the BUILDING_LIBCURL definition is still required.
     AC_DEFINE(BUILDING_LIBCURL, 1, [when building as static part of libcurl])
-    # CPPFLAGS="$CPPFLAGS -DCURLDEBUG"
-    CPPFLAGS="$CPPFLAGS -DCURLDEBUG -I../lib"
+    CPPFLAGS="$CPPFLAGS -DCURLDEBUG"
     squeeze CPPFLAGS
   fi
   #