diff --git a/decoder/ihevcd_parse_headers.c b/decoder/ihevcd_parse_headers.c
index a7ec5ad..578a429 100644
--- a/decoder/ihevcd_parse_headers.c
+++ b/decoder/ihevcd_parse_headers.c
@@ -1363,28 +1363,28 @@
     {
 
         UEV_PARSE("pic_crop_left_offset", value, ps_bitstrm);
-        if (value >= ps_sps->i2_pic_width_in_luma_samples)
+        if (value < 0 || value >= ps_sps->i2_pic_width_in_luma_samples)
         {
             return IHEVCD_INVALID_PARAMETER;
         }
         ps_sps->i2_pic_crop_left_offset = value;
 
         UEV_PARSE("pic_crop_right_offset", value, ps_bitstrm);
-        if (value >= ps_sps->i2_pic_width_in_luma_samples)
+        if (value < 0 || value >= ps_sps->i2_pic_width_in_luma_samples)
         {
             return IHEVCD_INVALID_PARAMETER;
         }
         ps_sps->i2_pic_crop_right_offset = value;
 
         UEV_PARSE("pic_crop_top_offset", value, ps_bitstrm);
-        if (value >= ps_sps->i2_pic_height_in_luma_samples)
+        if (value < 0 || value >= ps_sps->i2_pic_height_in_luma_samples)
         {
             return IHEVCD_INVALID_PARAMETER;
         }
         ps_sps->i2_pic_crop_top_offset = value;
 
         UEV_PARSE("pic_crop_bottom_offset", value, ps_bitstrm);
-        if (value >= ps_sps->i2_pic_height_in_luma_samples)
+        if (value < 0 || value >= ps_sps->i2_pic_height_in_luma_samples)
         {
             return IHEVCD_INVALID_PARAMETER;
         }