diff -Naur --exclude Makefile --exclude info wfdb-10.5.17/doc/wpg-src/wpg0.tex wfdb-10.5.18/doc/wpg-src/wpg0.tex
--- wfdb-10.5.17/doc/wpg-src/wpg0.tex	2013-01-02 17:51:05.000000000 -0500
+++ wfdb-10.5.18/doc/wpg-src/wpg0.tex	2013-02-22 13:01:40.000000000 -0500
@@ -9051,6 +9051,11 @@
 
 @unnumberedsec WFDB 10.5
 
+@unnumberedsubsec Changes in version 10.5.18 (22 February 2013)
+
+Function @code{wfdb_addtopath} now works properly if the path contained
+only one component on entry.
+
 @unnumberedsubsec Changes in version 10.5.17 (2 January 2013)
 
 The WFDB library internal function @code{wfdb_addtopath()} (in
diff -Naur --exclude Makefile --exclude info wfdb-10.5.17/lib/wfdb.h wfdb-10.5.18/lib/wfdb.h
--- wfdb-10.5.17/lib/wfdb.h	2013-01-02 18:25:57.000000000 -0500
+++ wfdb-10.5.18/lib/wfdb.h	2013-02-22 13:04:41.000000000 -0500
@@ -32,7 +32,7 @@
 /* WFDB library version. */
 #define WFDB_MAJOR   10
 #define WFDB_MINOR   5
-#define WFDB_RELEASE 17
+#define WFDB_RELEASE 18
 #define WFDB_NETFILES 1	/* if 1, library includes code for HTTP, FTP clients */
 #define WFDB_NETFILES_LIBCURL 1
 
diff -Naur --exclude Makefile --exclude info wfdb-10.5.17/lib/wfdbio.c wfdb-10.5.18/lib/wfdbio.c
--- wfdb-10.5.17/lib/wfdbio.c	2013-01-02 18:23:01.000000000 -0500
+++ wfdb-10.5.18/lib/wfdbio.c	2013-02-16 17:39:25.000000000 -0500
@@ -1,5 +1,5 @@
 /* file: wfdbio.c	G. Moody	18 November 1988
-                        Last revised:	 2 January 2013       wfdblib 10.5.17
+                        Last revised:	16 February 2013       wfdblib 10.5.18
 Low-level I/O functions for the WFDB library
 
 _______________________________________________________________________________
@@ -677,8 +677,9 @@
     /* (Re)link the unlinked node. */
     if (strcmp(c0->prefix, ".") == 0) {  /* skip initial "." if present */
 	c1->prev = c0;
-	c1->next = c0->next;
-	(c1->next)->prev = c0->next = c1;
+	if ((c1->next = c0->next) != NULL)
+	    (c1->next)->prev = c1;
+	c0->next = c1;
     }	
     else { /* no initial ".";  insert the node at the head of the path */ 
 	wfdb_path_list = c1;
diff -Naur --exclude Makefile --exclude info wfdb-10.5.17/NEWS wfdb-10.5.18/NEWS
--- wfdb-10.5.17/NEWS	2013-01-02 18:33:24.000000000 -0500
+++ wfdb-10.5.18/NEWS	2013-02-22 13:17:43.188250517 -0500
@@ -1,3 +1,7 @@
+10.5.18 (16 February 2013):
+	wfdb_addtopath now works properly if the path contained only one
+	component on entry.
+
 10.5.17 (2 January 2013):
 	A small change in the 'configure' script works around a problem
 	in building WFDB applications on recent versions of Debian and