diff --git a/src/alloc.c b/src/alloc.c
index 5f39085bce..386964c5b6 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -770,7 +770,10 @@ ga_concat_strings(garray_T *gap, char *sep)
     char_u	*p;
 
     for (i = 0; i < gap->ga_len; ++i)
-	len += (int)STRLEN(((char_u **)(gap->ga_data))[i]) + sep_len;
+	len += (int)STRLEN(((char_u **)(gap->ga_data))[i]);
+
+    if (gap->ga_len > 1)
+	len += (gap->ga_len - 1) * sep_len;
 
     s = alloc(len + 1);
     if (s == NULL)
diff --git a/src/version.c b/src/version.c
index b0ce4f3110..db3a4b7ac3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -724,6 +724,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1691,
 /**/
     1690,
 /**/