diff --git a/lib/includes/nghttp2/nghttp2.h b/lib/includes/nghttp2/nghttp2.h
index f7e6052d..b1028a86 100644
--- a/lib/includes/nghttp2/nghttp2.h
+++ b/lib/includes/nghttp2/nghttp2.h
@@ -36,7 +36,14 @@ extern "C" {
 #endif
 
 #include <stdlib.h>
+#if defined(_MSC_VER) && (_MSC_VER < 1800)
+/* MSVC < 2013 does not have inttypes.h because it is not C99
+   compliant.  See compiler macros and version number in
+   https://sourceforge.net/p/predef/wiki/Compilers/ */
+#include <stdint.h>
+#else /* !defined(_MSC_VER) || (_MSC_VER >= 1800) */
 #include <inttypes.h>
+#endif /* !defined(_MSC_VER) || (_MSC_VER >= 1800) */
 #include <sys/types.h>
 
 #include <nghttp2/nghttp2ver.h>