diff --git a/src/lib/openjp2/openjpeg.h b/src/lib/openjp2/openjpeg.h
index 44fb8492..d560e304 100644
--- a/src/lib/openjp2/openjpeg.h
+++ b/src/lib/openjp2/openjpeg.h
@@ -486,9 +486,9 @@ typedef void * opj_codec_t;
  * Stream open flags.
  */
 /** The stream was opened for reading. */
-#define OPJ_STREAM_READ	0x0001
+#define OPJ_STREAM_READ	OPJ_TRUE
 /** The stream was opened for writing. */
-#define OPJ_STREAM_WRITE 0x0002
+#define OPJ_STREAM_WRITE OPJ_FALSE