diff --git a/tests/test_tile_decoder.c b/tests/test_tile_decoder.c
index 5a53beea..7560af5f 100644
--- a/tests/test_tile_decoder.c
+++ b/tests/test_tile_decoder.c
@@ -99,7 +99,7 @@ static int infile_format(const char *fname)
                 return -1;
 
         memset(buf, 0, 12);
-        l_nb_read = fread(buf, 1, 12, reader);
+        l_nb_read = (unsigned int)fread(buf, 1, 12, reader);
         fclose(reader);
         if (l_nb_read != 12)
                 return -1;
@@ -136,20 +136,6 @@ static int infile_format(const char *fname)
 
 /* -------------------------------------------------------------------------- */
 
-/**
-  sample error callback expecting a FILE* client object
- */
-static void error_callback_file(const char *msg, void *client_data) {
-        FILE *stream = (FILE*)client_data;
-        fprintf(stream, "[ERROR] %s", msg);
-}
-/**
-  sample warning callback expecting a FILE* client object
- */
-static void warning_callback_file(const char *msg, void *client_data) {
-        FILE *stream = (FILE*)client_data;
-        fprintf(stream, "[WARNING] %s", msg);
-}
 /**
   sample error debug callback expecting no client object
  */
diff --git a/tests/test_tile_encoder.c b/tests/test_tile_encoder.c
index 62becce7..89b5f901 100644
--- a/tests/test_tile_encoder.c
+++ b/tests/test_tile_encoder.c
@@ -132,7 +132,7 @@ int main (int argc, char *argv[])
 
 	fprintf(stdout, "Encoding random values -> keep in mind that this is very hard to compress\n");
 	for (i=0;i<l_data_size;++i)	{
-		l_data[i] = i; /*rand();*/
+		l_data[i] = (OPJ_BYTE)i; /*rand();*/
 	}
 
 	opj_set_default_encoder_parameters(&l_param);
@@ -226,7 +226,7 @@ int main (int argc, char *argv[])
 	}
 
   /* should we do j2k or jp2 ?*/
-  len = strlen( output_file );
+  len = (unsigned char)strlen( output_file );
   if( strcmp( output_file + len - 4, ".jp2" ) == 0 )
     {
     l_codec = opj_create_compress(OPJ_CODEC_JP2);