diff --git a/src/bin/common/color.c b/src/bin/common/color.c
index f18eb801..6cb98497 100644
--- a/src/bin/common/color.c
+++ b/src/bin/common/color.c
@@ -388,7 +388,8 @@ fprintf(stderr,"%s:%d:color_apply_icc_profile\n\tcmsCreateTransform failed. "
 	if(image->numcomps > 2)/* RGB, RGBA */
    {
 	unsigned short *inbuf, *outbuf, *in, *out;
-	max = max_w * max_h; nr_samples = max * 3 * sizeof(unsigned short);
+	max = max_w * max_h;
+  nr_samples = (cmsUInt32Number)(max * 3 * sizeof(unsigned short));
 	in = inbuf = (unsigned short*)malloc(nr_samples);
 	out = outbuf = (unsigned short*)malloc(nr_samples);
 
diff --git a/src/bin/jp2/opj_decompress.c b/src/bin/jp2/opj_decompress.c
index b2e4e83c..dd1a0775 100644
--- a/src/bin/jp2/opj_decompress.c
+++ b/src/bin/jp2/opj_decompress.c
@@ -271,7 +271,7 @@ static int infile_format(const char *fname)
 	const char *s, *magic_s;
 	int ext_format, magic_format;
 	unsigned char buf[12];
-	unsigned int l_nb_read;
+	OPJ_SIZE_T l_nb_read;
 
 	reader = fopen(fname, "rb");
 
diff --git a/src/lib/openjp2/dwt.c b/src/lib/openjp2/dwt.c
index 7d87a9f8..c617ffcf 100644
--- a/src/lib/openjp2/dwt.c
+++ b/src/lib/openjp2/dwt.c
@@ -404,7 +404,7 @@ INLINE OPJ_BOOL opj_dwt_encode_procedure(opj_tcd_tilecomp_t * tilec,void (*p_fun
 	rw = l_cur_res->x1 - l_cur_res->x0;
 	rh = l_cur_res->y1 - l_cur_res->y0;
 
-	l_data_size = opj_dwt_max_resolution( tilec->resolutions,tilec->numresolutions) * sizeof(OPJ_INT32);
+	l_data_size = opj_dwt_max_resolution( tilec->resolutions,tilec->numresolutions) * (OPJ_UINT32)sizeof(OPJ_INT32);
 	bj = (OPJ_INT32*)opj_malloc(l_data_size);
 	if (! bj) {
 		return OPJ_FALSE;