diff --git a/build.vc9/mpir-tests/run-tests.py b/build.vc9/mpir-tests/run-tests.py
index 1cbd2492..f168f75f 100644
--- a/build.vc9/mpir-tests/run-tests.py
+++ b/build.vc9/mpir-tests/run-tests.py
@@ -68,15 +68,15 @@ for i in prj_list :
     if output :
       print('    ', output.decode(), end = '')
   else :
-    print("Build failure for %s" % i)
+    print("Build failure for {0}".format(i))
     build_fail += 1
 print(build_fail + run_ok + run_fail, "tests:")
 if build_fail > 0 :
-  print("\t%i failed to build" % build_fail)
+  print("\t{0} failed to build".format(build_fail))
 if run_ok > 0 :
-  print("\t%i ran correctly" % run_ok)
+  print("\t{0} ran correctly".format(run_ok))
 if run_fail > 0 :
-  print("\t%i failed" % run_fail) 
+  print("\t{0} failed".format(run_fail)) 
 if len(sys.argv) == 1 :
   try :
     input(".. completed - press ENTER")
diff --git a/mpn/generic/invert.c b/mpn/generic/invert.c
index bdfd2ba9..9804615d 100644
--- a/mpn/generic/invert.c
+++ b/mpn/generic/invert.c
@@ -33,6 +33,8 @@ MA 02110-1301, USA. */
 #define ONE  (mp_limb_t) 1
 #define WRAP_AROUND_BOUND 1500
 
+#ifndef _MSC_VER
+
 int
 test_invert (mp_ptr xp, mp_srcptr ap, mp_size_t n)
 {
@@ -62,6 +64,8 @@ test_invert (mp_ptr xp, mp_srcptr ap, mp_size_t n)
   return res;
 }
 
+#endif
+
 /* Input: A = {ap, n} with most significant bit set.
    Output: X = B^n + {xp, n} where B = 2^GMP_NUMB_BITS.