diff --git a/libopenjpeg/j2k.c b/libopenjpeg/j2k.c
index 958c5fb3..aa866346 100644
--- a/libopenjpeg/j2k.c
+++ b/libopenjpeg/j2k.c
@@ -36,6 +36,8 @@
 #include "opj_includes.h"
 #ifdef HAVE_INTTYPES_H
 #include <inttypes.h> /* PRIi64 */
+#else
+#define PRIi64 "I64i"
 #endif
 
 /** @defgroup J2K J2K - JPEG-2000 codestream reader/writer */