diff --git a/src/bin/jp2/opj_decompress.c b/src/bin/jp2/opj_decompress.c
index b5a7db2c..4f3c164b 100644
--- a/src/bin/jp2/opj_decompress.c
+++ b/src/bin/jp2/opj_decompress.c
@@ -1341,7 +1341,8 @@ int main(int argc, char **argv)
 {
     opj_decompress_parameters parameters;           /* decompression parameters */
 
-    unsigned int num_images, imageno;
+    unsigned int num_images;
+    OPJ_INT32 imageno;
     img_fol_t img_fol;
     dircnt_t *dirptr = NULL;
     int failed = 0;