diff --git a/src/err.h b/src/err.h
index aeb05c83..fdbcd947 100644
--- a/src/err.h
+++ b/src/err.h
@@ -119,6 +119,7 @@
 #define E_NO_MATCHING_REMS  100
 #define E_STRING_TOO_LONG   101
 #define E_TIME_TWICE        102
+#define E_DURATION_NO_AT    103
 #ifdef MK_GLOBALS
 #undef EXTERN
 #define EXTERN
@@ -234,7 +235,8 @@ EXTERN char *ErrMsg[]
     "Can't convert between time zones",
     "No files matching *.rem",
     "String too long",
-    "Time specified twice"
+    "Time specified twice",
+    "Cannot specify DURATION without specifying AT"
 }
 #endif /* MK_GLOBALS */
 ;
diff --git a/src/langs/finnish.h b/src/langs/finnish.h
index 5b0fbe75..4da6b8f2 100644
--- a/src/langs/finnish.h
+++ b/src/langs/finnish.h
@@ -302,7 +302,8 @@ EXTERN char *ErrMsg[] =
     "Can't convert between time zones",
     "No files matching *.rem",
     "String too long",
-    "Time specified twice"
+    "Time specified twice",
+    "Cannot specify DURATION without specifying AT"
 
 #elif IBMEXTENDED
     "Ok",
@@ -407,7 +408,8 @@ EXTERN char *ErrMsg[] =
     "Can't convert between time zones",
     "No files matching *.rem",
     "String too long",
-    "Time specified twice"
+    "Time specified twice",
+    "Cannot specify DURATION without specifying AT"
 
 #else
     "Ok",
@@ -512,7 +514,8 @@ EXTERN char *ErrMsg[] =
     "Can't convert between time zones",
     "No files matching *.rem",
     "String too long",
-    "Time specified twice"
+    "Time specified twice",
+    "Cannot specify DURATION without specifying AT"
 
 
 #endif
diff --git a/src/langs/french.h b/src/langs/french.h
index 2a68b371..b93d424b 100644
--- a/src/langs/french.h
+++ b/src/langs/french.h
@@ -242,7 +242,8 @@ EXTERN char *ErrMsg[] =
     "Can't convert between time zones",
     "No files matching *.rem",
     "String too long",
-    "Time specified twice"
+    "Time specified twice",
+    "Cannot specify DURATION without specifying AT"
 
 #else /* ISOLATIN1 */
     "Ok",
@@ -347,7 +348,8 @@ EXTERN char *ErrMsg[] =
     "Can't convert between time zones",
     "No files matching *.rem",
     "String too long",
-    "Time specified twice"
+    "Time specified twice",
+    "Cannot specify DURATION without specifying AT"
 #endif /* ISOLATIN1 */
 };
 #endif /* MK_GLOBALS */
diff --git a/src/langs/polish.h b/src/langs/polish.h
index 5b8bd995..dbe173c6 100644
--- a/src/langs/polish.h
+++ b/src/langs/polish.h
@@ -281,7 +281,8 @@ EXTERN char *ErrMsg[] =
     "Can't convert between time zones",
     "No files matching *.rem",
     "String too long",
-    "Time specified twice"
+    "Time specified twice",
+    "Cannot specify DURATION without specifying AT"
 #else /* ISOLATIN1 */
     "OK",
     "Brakujacy ']'",
@@ -385,7 +386,8 @@ EXTERN char *ErrMsg[] =
     "Can't convert between time zones",
     "No files matching *.rem",
     "String too long",
-    "Time specified twice"
+    "Time specified twice",
+    "Cannot specify DURATION without specifying AT"
 #endif /* ISOLATIN1 */
 };
 #endif /* MK_GLOBALS */
diff --git a/src/langs/portbr.h b/src/langs/portbr.h
index 40d31454..ca7e905c 100644
--- a/src/langs/portbr.h
+++ b/src/langs/portbr.h
@@ -247,7 +247,8 @@ EXTERN char *ErrMsg[] =
     "Can't convert between time zones",
     "No files matching *.rem",
     "String too long",
-    "Time specified twice"
+    "Time specified twice",
+    "Cannot specify DURATION without specifying AT"
 };
 #endif /* MK_GLOBALS */
 
diff --git a/src/trigger.c b/src/trigger.c
index eec5d03a..63a7346d 100644
--- a/src/trigger.c
+++ b/src/trigger.c
@@ -513,6 +513,11 @@ int ComputeTriggerNoAdjustDuration(int today, Trigger *trig, TimeTrig *tim,
 	return -1;
     }
 
+    if (tim->duration != NO_TIME && tim->ttime == NO_TIME) {
+	*err = E_DURATION_NO_AT;
+	return -1;
+    }
+
     if (trig->rep != NO_REP &&
 	(trig->d == NO_DAY ||
 	 trig->m == NO_MON ||
diff --git a/tests/test.cmp b/tests/test.cmp
index e2a94526..3ff310a3 100644
--- a/tests/test.cmp
+++ b/tests/test.cmp
@@ -1379,6 +1379,9 @@ $Tw => 4
 Thursday, the 14th
 
 
+# This is now an error
+REM DURATION 15:00 MSG Should fail... need AT if you have DURATION.
+../tests/test.rem(396): Cannot specify DURATION without specifying AT
 
 
 
diff --git a/tests/test.rem b/tests/test.rem
index 5393fca8..44c9dcfb 100644
--- a/tests/test.rem
+++ b/tests/test.rem
@@ -392,6 +392,8 @@ REM 14 AT 16:00 DURATION 8:00 SATISFY [$Tw == 4] MSG Thursday, the 14th
 REM 14 AT 16:00 DURATION 32:00 SATISFY [$Tw == 4] MSG Thursday, the 14th
 REM 14 AT 16:00 DURATION 40:00 SATISFY [$Tw == 4] MSG Thursday, the 14th
 
+# This is now an error
+REM DURATION 15:00 MSG Should fail... need AT if you have DURATION.
 
 __EOF__
 REM This line should not even be seen