diff --git a/pcapio.h b/pcapio.h
index 8a0a308a8b..2281e563d0 100644
--- a/pcapio.h
+++ b/pcapio.h
@@ -65,7 +65,7 @@ libpcap_write_session_header_block(FILE *fp,             /**< File pointer */
 extern gboolean
 libpcap_write_interface_description_block(FILE *fp,
                                           const char *comment,  /* OPT_COMMENT           1 */
-                                          const char *name,     /* IDB_NAME			     2 */
+                                          const char *name,     /* IDB_NAME              2 */
                                           const char *descr,    /* IDB_DESCRIPTION       3 */
                                           const char *filter,   /* IDB_FILTER           11 */
                                           const char *os,       /* IDB_OS               12 */