diff --git a/src/bin/jp2/opj_compress.c b/src/bin/jp2/opj_compress.c
index 493555db..59d28afb 100644
--- a/src/bin/jp2/opj_compress.c
+++ b/src/bin/jp2/opj_compress.c
@@ -699,7 +699,7 @@ static int parse_cmdline_encoder(int argc, char **argv, opj_cparameters_t *param
             OPJ_UINT32 numlayers = 0, numresolution = 0, matrix_width = 0;
 
             char *s = opj_optarg;
-            sscanf(s, "%ud", &numlayers);
+            sscanf(s, "%u", &numlayers);
             s++;
             if (numlayers > 9)
                 s++;
@@ -871,7 +871,7 @@ static int parse_cmdline_encoder(int argc, char **argv, opj_cparameters_t *param
             char *s = opj_optarg;
             POC = parameters->POC;
 
-            while (sscanf(s, "T%ud=%ud,%ud,%ud,%ud,%ud,%4s", &POC[numpocs].tile,
+            while (sscanf(s, "T%u=%u,%u,%u,%u,%u,%4s", &POC[numpocs].tile,
                           &POC[numpocs].resno0, &POC[numpocs].compno0,
                           &POC[numpocs].layno1, &POC[numpocs].resno1,
                           &POC[numpocs].compno1, POC[numpocs].progorder) == 7) {
diff --git a/src/bin/jp2/opj_decompress.c b/src/bin/jp2/opj_decompress.c
index a6bc182a..136cc9c1 100644
--- a/src/bin/jp2/opj_decompress.c
+++ b/src/bin/jp2/opj_decompress.c
@@ -629,7 +629,7 @@ int parse_cmdline_decoder(int argc, char **argv, opj_decompress_parameters *para
 
 			case 'r':		/* reduce option */
 			{
-				sscanf(opj_optarg, "%ud", &(parameters->core.cp_reduce));
+				sscanf(opj_optarg, "%u", &(parameters->core.cp_reduce));
 			}
 			break;
 			
@@ -638,7 +638,7 @@ int parse_cmdline_decoder(int argc, char **argv, opj_decompress_parameters *para
 
 			case 'l':		/* layering option */
 			{
-				sscanf(opj_optarg, "%ud", &(parameters->core.cp_layer));
+				sscanf(opj_optarg, "%u", &(parameters->core.cp_layer));
 			}
 			break;
 			
@@ -678,7 +678,7 @@ int parse_cmdline_decoder(int argc, char **argv, opj_decompress_parameters *para
 
 			case 't':     		/* Input tile index */
 			{
-				sscanf(opj_optarg, "%ud", &parameters->tile_index);
+				sscanf(opj_optarg, "%u", &parameters->tile_index);
 				parameters->nb_tile_to_decode = 1;
 			}
 			break;