diff --git a/src/bin/jp2/convertpng.c b/src/bin/jp2/convertpng.c
index 44d985f..b85e126 100644
--- a/src/bin/jp2/convertpng.c
+++ b/src/bin/jp2/convertpng.c
@@ -75,10 +75,10 @@ opj_image_t *pngtoimage(const char *read_idf, opj_cparameters_t * params)
     png_uint_32  width, height = 0U;
     int color_type;
     FILE *reader = NULL;
-    OPJ_BYTE** rows = NULL;
-    OPJ_INT32* row32s = NULL;
+    OPJ_BYTE** volatile rows = NULL;
+    OPJ_INT32* volatile row32s = NULL;
     /* j2k: */
-    opj_image_t *image = NULL;
+    opj_image_t* volatile image = NULL;
     opj_image_cmptparm_t cmptparm[4];
     OPJ_UINT32 nr_comp;
     OPJ_BYTE sigbuf[8];
diff --git a/src/bin/jp2/converttif.c b/src/bin/jp2/converttif.c
index 6714d69..625c407 100644
--- a/src/bin/jp2/converttif.c
+++ b/src/bin/jp2/converttif.c
@@ -714,7 +714,7 @@ int imagetotif(opj_image_t * image, const char *outfile)
         TIFFClose(tif);
         return 1;
     }
-    rowStride = (int64_t)((width * numcomps * bps + 7U) / 8U);
+    rowStride = ((int64_t)width * numcomps * bps + 7U) / 8U;
     if (rowStride != strip_size) {
         fprintf(stderr, "Invalid TIFF strip size\n");
         TIFFClose(tif);
@@ -1277,8 +1277,6 @@ opj_image_t* tiftoimage(const char *filename, opj_cparameters_t *parameters)
     TIFFGetField(tif, TIFFTAG_SAMPLESPERPIXEL, &tiSpp);
     TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &tiPhoto);
     TIFFGetField(tif, TIFFTAG_PLANARCONFIG, &tiPC);
-    w = (int)tiWidth;
-    h = (int)tiHeight;
 
     if (tiSpp == 0 || tiSpp > 4) { /* should be 1 ... 4 */
         fprintf(stderr, "tiftoimage: Bad value for samples per pixel == %d.\n"
@@ -1445,7 +1443,7 @@ opj_image_t* tiftoimage(const char *filename, opj_cparameters_t *parameters)
         return NULL;
     }
 
-    rowStride = (int64_t)((tiWidth * tiSpp * tiBps + 7U) / 8U);
+    rowStride = ((int64_t)tiWidth * tiSpp * tiBps + 7U) / 8U;
     buffer32s = (OPJ_INT32 *)malloc(sizeof(OPJ_INT32) * tiWidth * tiSpp);
     if (buffer32s == NULL) {
         _TIFFfree(buf);