diff --git a/epan/dissectors/packet-gsm_a_bssmap.c b/epan/dissectors/packet-gsm_a_bssmap.c
index a85d57c574..450c65933a 100644
--- a/epan/dissectors/packet-gsm_a_bssmap.c
+++ b/epan/dissectors/packet-gsm_a_bssmap.c
@@ -1126,7 +1126,7 @@ be_tmsi(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, guint32 offset, gui
  * [2] 3.2.2.8 Number Of MSs
  */
 static guint16
-be_num_ms(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
+be_num_ms(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_, guint32 offset, guint len _U_, gchar *add_string _U_, int string_len _U_)
 {
     guint32 curr_offset;
 
@@ -1135,7 +1135,7 @@ be_num_ms(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, guint32 offset, g
     proto_tree_add_item(tree, hf_gsm_a_bssmap_num_ms, tvb, curr_offset, 1, ENC_BIG_ENDIAN);
     curr_offset++;
 
-    EXTRANEOUS_DATA_CHECK(len, curr_offset - offset, pinfo, &ei_gsm_a_bssmap_extraneous_data);
+   /* no length check possible */
 
     return(curr_offset - offset);
 }