diff --git a/sigma/sigma_bugs.txt b/sigma/sigma_bugs.txt
index a034283e..b6ea4c5a 100644
--- a/sigma/sigma_bugs.txt
+++ b/sigma/sigma_bugs.txt
@@ -122,6 +122,7 @@
 116: IO: dangling else in write direct mode 1 code causes incorrect behavior.
 117: CPU: sim_interval is decremented before breakpoint test, which is incorrect.
 118. MT: revised error handling failed to set tape mark status on space file forward/reverse.
+119. IO: UEND flag in the wrong bit position in status word.
 
 
 Diagnostic Notes
diff --git a/sigma/sigma_io_defs.h b/sigma/sigma_io_defs.h
index 6dedd093..921c6f3a 100644
--- a/sigma/sigma_io_defs.h
+++ b/sigma/sigma_io_defs.h
@@ -22,6 +22,8 @@
    Except as contained in this notice, the name of Robert M Supnik shall not be
    used in advertising or otherwise to promote the sale, use or other dealings
    in this Software without prior written authorization from Robert M Supnik.
+
+   21-Jul-22    RMS     Channel UEND flag in wrong bit position (Ken Rector)
 */
 
 #ifndef SIGMA_IO_DEFS_H_
@@ -97,7 +99,7 @@ typedef struct {
 /* Channel flags */
 
 #define CHF_INP         0x8000                          /* int pending */
-#define CHF_UEN         0x0400                          /* unusual end */
+#define CHF_UEN         0x0800                          /* unusual end */
 #define CHF_LNTE        0x0080                          /* length error */
 #define CHF_XMDE        0x0040                          /* xmit data error */
 #define CHF_XMME        0x0020                          /* xmit mem error */