diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 63d4c8b36..cae901511 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,7 @@
+2012-03-20  Corinna Vinschen  <corinna@vinschen.de>
+
+	* syscalls.cc (lseek): Fix debug output.
+
 2012-03-20  Christian Franke  <franke@computer.org>
 
 	* ntdll.h (SharedUserData): Add volatile qualifier. This fixes a
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 21037fa10..80d22b232 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -1344,7 +1344,10 @@ lseek64 (int fd, _off64_t pos, int dir)
       else
 	res = -1;
     }
-  syscall_printf ("%R = lseek(%d, %D, %d)", res, fd, pos, dir);
+  /* Can't use %R here since res is 8 bytes */
+  syscall_printf (res == -1 ? "%D = lseek(%d, %D, %d), errno %d"
+			    : "%D = lseek(%d, %D, %d)",
+		  res, fd, pos, dir, get_errno ());
 
   return res;
 }