diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 84e1ede2b..33699dde7 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,9 @@
+2012-06-21  Corinna Vinschen  <corinna@vinschen.de>
+
+	* path.cc (realpath): Call mount_info::conv_to_posix_path rather than
+	mount_info::cygdrive_posix_path to convert DOS paths to POSIX paths.
+	Add comment to explain why that's necessary at all.
+
 2012-06-18  Christopher Faylor  <me.cygwin2012@cgf.cx>
 
 	* cygwait.h (LARGE_NULL): Define.
diff --git a/winsup/cygwin/path.cc b/winsup/cygwin/path.cc
index 59e6de384..3b3958d8b 100644
--- a/winsup/cygwin/path.cc
+++ b/winsup/cygwin/path.cc
@@ -3206,11 +3206,14 @@ realpath (const char *path, char *resolved)
   if (efault.faulted (EFAULT))
     return NULL;
 
+  /* Win32 drive letter paths have to be converted to a POSIX path first,
+     because path_conv lets the incoming path untouched except for converting
+     backslashes to forward slashes. */
   char *tpath;
   if (isdrive (path))
     {
       tpath = tp.c_get ();
-      mount_table->cygdrive_posix_path (path, tpath, 0);
+      mount_table->conv_to_posix_path (path, tpath, 0);
     }
   else
     tpath = (char *) path;