diff --git a/epan/dissectors/packet-6lowpan.c b/epan/dissectors/packet-6lowpan.c
index c2cad2c43e..a5e55c50e9 100644
--- a/epan/dissectors/packet-6lowpan.c
+++ b/epan/dissectors/packet-6lowpan.c
@@ -1758,7 +1758,7 @@ dissect_6lowpan_hc1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint dg
 
         /* Construct the next header for the UDP datagram. */
         offset = BITS_TO_BYTE_LEN(0, bit_offset);
-        length = (gint)tvb_ensure_captured_length_remaining(tvb, offset);
+        length = tvb_captured_length_remaining(tvb, offset);
         nhdr_list = (struct lowpan_nhdr *)wmem_alloc(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + sizeof(struct udp_hdr) + length);
         nhdr_list->next = NULL;
         nhdr_list->proto = IP_PROTO_UDP;
@@ -1776,7 +1776,7 @@ dissect_6lowpan_hc1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint dg
     else {
         gint length;
         offset = BITS_TO_BYTE_LEN(0, bit_offset);
-        length = (gint)tvb_ensure_captured_length_remaining(tvb, offset);
+        length = tvb_captured_length_remaining(tvb, offset);
         nhdr_list = (struct lowpan_nhdr *)wmem_alloc(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + length);
         nhdr_list->next = NULL;
         nhdr_list->proto = ipv6.ip6h_nxt;
@@ -2214,7 +2214,7 @@ dissect_6lowpan_iphc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint d
     }
     /* Create an extension header for the remaining payload. */
     else {
-        length = (gint)tvb_ensure_captured_length_remaining(tvb, offset);
+        length = tvb_captured_length_remaining(tvb, offset);
         nhdr_list = (struct lowpan_nhdr *)wmem_alloc(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + length);
         nhdr_list->next = NULL;
         nhdr_list->proto = ipv6.ip6h_nxt;
@@ -2424,7 +2424,7 @@ dissect_6lowpan_iphc_nhc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gi
         }
         else if (ipv6_ext.ip6e_nxt != IP_PROTO_NONE) {
             /* Create another next header structure for the remaining payload. */
-            length = (gint)tvb_ensure_captured_length_remaining(tvb, offset);
+            length = tvb_captured_length_remaining(tvb, offset);
             nhdr->next = (struct lowpan_nhdr *)wmem_alloc(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + length);
             nhdr->next->next = NULL;
             nhdr->next->proto = ipv6_ext.ip6e_nxt;
@@ -2571,7 +2571,7 @@ dissect_6lowpan_iphc_nhc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gi
 #endif
 
         /* Create the next header structure for the UDP datagram. */
-        length = (gint)tvb_ensure_captured_length_remaining(tvb, offset);
+        length = tvb_captured_length_remaining(tvb, offset);
         nhdr = (struct lowpan_nhdr *)wmem_alloc(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + sizeof(struct udp_hdr) + length);
         nhdr->next = NULL;
         nhdr->proto = IP_PROTO_UDP;