diff --git a/utest/ctest.h b/utest/ctest.h
index d316b1494..037f7f28d 100644
--- a/utest/ctest.h
+++ b/utest/ctest.h
@@ -28,7 +28,10 @@
 #define WEAK
 #endif
 
+#ifndef __MSC_VER
 #include <inttypes.h> /* intmax_t, uintmax_t, PRI* */
+#endif
+
 #include <stddef.h> /* size_t */
 
 typedef void (*SetupFunc)(void*);
@@ -72,6 +75,13 @@ struct ctest {
 #define __CTEST_NO_TIME
 #define CTEST_NO_COLORS
 
+#if __MSC_VER >= 1500
+#include <inttypes.h>
+#else
+#include <stdint.h>
+#define CTEST_NO_INTTYPES
+#endif
+
 #ifndef CTEST_ADD_TESTS_MANUALLY
 #pragma section(".ctest$a")
 #pragma section(".ctest$u")
@@ -480,11 +490,19 @@ void assert_data(const unsigned char* exp, size_t expsize,
                  const char* caller, int line) {
     size_t i;
     if (expsize != realsize) {
+#ifndef CTEST_NO_INTTYPES
         CTEST_ERR("%s:%d  expected %" PRIuMAX " bytes, got %" PRIuMAX, caller, line, (uintmax_t) expsize, (uintmax_t) realsize);
+#else
+        CTEST_ERR("%s:%d  expected %u bytes, got %u", caller, line, (uintmax_t) expsize, (uintmax_t) realsize);
+#endif
     }
     for (i=0; i<expsize; i++) {
         if (exp[i] != real[i]) {
+#ifndef CTEST_NO_INTTYPES
             CTEST_ERR("%s:%d expected 0x%02x at offset %" PRIuMAX " got 0x%02x",
+#else
+            CTEST_ERR("%s:%d expected 0x%02x at offset %u got 0x%02x",
+#endif
                 caller, line, exp[i], (uintmax_t) i, real[i]);
         }
     }
@@ -492,31 +510,51 @@ void assert_data(const unsigned char* exp, size_t expsize,
 
 void assert_equal(intmax_t exp, intmax_t real, const char* caller, int line) {
     if (exp != real) {
+#ifndef CTEST_NO_INTTYPES
         CTEST_ERR("%s:%d  expected %" PRIdMAX ", got %" PRIdMAX, caller, line, exp, real);
+#else
+        CTEST_ERR("%s:%d  expected %d, got %d", caller, line, exp, real);
+#endif
     }
 }
 
 void assert_equal_u(uintmax_t exp, uintmax_t real, const char* caller, int line) {
     if (exp != real) {
+#ifndef CTEST_NO_INTTYPES
         CTEST_ERR("%s:%d  expected %" PRIuMAX ", got %" PRIuMAX, caller, line, exp, real);
+#else
+        CTEST_ERR("%s:%d  expected %u, got %u", caller, line, exp, real);
+#endif
     }
 }
 
 void assert_not_equal(intmax_t exp, intmax_t real, const char* caller, int line) {
     if ((exp) == (real)) {
+#ifndef CTEST_NO_INTTYPES
         CTEST_ERR("%s:%d  should not be %" PRIdMAX, caller, line, real);
+#else
+        CTEST_ERR("%s:%d  should not be %d", caller, line, real);
+#endif
     }
 }
 
 void assert_not_equal_u(uintmax_t exp, uintmax_t real, const char* caller, int line) {
     if ((exp) == (real)) {
+#ifndef CTEST_NO_INTTYPES
         CTEST_ERR("%s:%d  should not be %" PRIuMAX, caller, line, real);
+#else
+        CTEST_ERR("%s:%d  should not be %u", caller, line, real);
+#endif
     }
 }
 
 void assert_interval(intmax_t exp1, intmax_t exp2, intmax_t real, const char* caller, int line) {
     if (real < exp1 || real > exp2) {
+#ifndef CTEST_NO_INTTYPES
         CTEST_ERR("%s:%d  expected %" PRIdMAX "-%" PRIdMAX ", got %" PRIdMAX, caller, line, exp1, exp2, real);
+#else
+        CTEST_ERR("%s:%d  expected %d-%d, got %d", caller, line, exp1, exp2, real);
+#endif
     }
 }