diff --git a/src/lib/openjp2/jp2.c b/src/lib/openjp2/jp2.c
index 6bc704e2..1211ab5d 100644
--- a/src/lib/openjp2/jp2.c
+++ b/src/lib/openjp2/jp2.c
@@ -3246,6 +3246,8 @@ static OPJ_BOOL opj_jpip_write_fidx(opj_jp2_t *jp2,
     OPJ_OFF_T j2k_codestream_exit;
     OPJ_BYTE l_data_header [24];
 
+    OPJ_UNUSED(jp2);
+
     /* preconditions */
     assert(jp2 != 00);
     assert(cio != 00);
@@ -3279,6 +3281,8 @@ static OPJ_BOOL opj_jpip_write_cidx(opj_jp2_t *jp2,
     OPJ_OFF_T j2k_codestream_exit;
     OPJ_BYTE l_data_header [24];
 
+    OPJ_UNUSED(jp2);
+
     /* preconditions */
     assert(jp2 != 00);
     assert(cio != 00);