diff --git a/src/lib/openjp2/j2k.c b/src/lib/openjp2/j2k.c
index 28c7513f..4169cd67 100644
--- a/src/lib/openjp2/j2k.c
+++ b/src/lib/openjp2/j2k.c
@@ -1925,7 +1925,8 @@ static OPJ_BOOL opj_j2k_read_soc(opj_j2k_t *p_j2k,
     /* FIXME move it in a index structure included in p_j2k*/
     p_j2k->cstr_index->main_head_start = opj_stream_tell(p_stream) - 2;
 
-    opj_event_msg(p_manager, EVT_INFO, "Start to read j2k main header (%d).\n",
+    opj_event_msg(p_manager, EVT_INFO,
+                  "Start to read j2k main header (%" PRId64 ").\n",
                   p_j2k->cstr_index->main_head_start);
 
     /* Add the marker to the codestream index*/
diff --git a/src/lib/openjp2/jp2.c b/src/lib/openjp2/jp2.c
index c79ea731..f15f45ae 100644
--- a/src/lib/openjp2/jp2.c
+++ b/src/lib/openjp2/jp2.c
@@ -1005,7 +1005,7 @@ static OPJ_BOOL opj_jp2_check_color(opj_image_t *image, opj_jp2_color_t *color,
                 if (!pcol_usage[i]) {
                     is_sane = 0U;
                     opj_event_msg(p_manager, EVT_WARNING,
-                                  "Component mapping seems wrong. Trying to correct.\n", i);
+                                  "Component mapping seems wrong. Trying to correct.\n");
                     break;
                 }
             }