diff --git a/historic/jam/src/timestamp.c b/historic/jam/src/timestamp.c
index 88d2bdc50..fb0b7d405 100644
--- a/historic/jam/src/timestamp.c
+++ b/historic/jam/src/timestamp.c
@@ -83,7 +83,14 @@ timestamp(
         p = path.value;
 
 	do
-            *p = tolower( *p );
+    {
+        *p = tolower( *p );
+#  ifdef NT
+        /* On NT, we must use backslashes or the file won't be found. */
+        if (*p == '/')
+            *p = PATH_DELIM;
+#  endif 
+    }
 	while( *p++ );
 
 	target = path.value;
diff --git a/jam_src/timestamp.c b/jam_src/timestamp.c
index 88d2bdc50..fb0b7d405 100644
--- a/jam_src/timestamp.c
+++ b/jam_src/timestamp.c
@@ -83,7 +83,14 @@ timestamp(
         p = path.value;
 
 	do
-            *p = tolower( *p );
+    {
+        *p = tolower( *p );
+#  ifdef NT
+        /* On NT, we must use backslashes or the file won't be found. */
+        if (*p == '/')
+            *p = PATH_DELIM;
+#  endif 
+    }
 	while( *p++ );
 
 	target = path.value;