X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/6681531ad79b73f4e811037481a0055ace41e46d..51c7471d48efd62b2d4f5647782ba1e849d4c35a:/src/src/expand.c

diff --git a/src/src/expand.c b/src/src/expand.c
index bd097db43..64a3a86e6 100644
--- a/src/src/expand.c
+++ b/src/src/expand.c
@@ -2849,7 +2849,9 @@ switch(cond_type)
     be no maintenance burden from replicating it. */
     if (len == 0)
       boolvalue = FALSE;
-    else if (Ustrspn(t, "0123456789") == len)
+    else if (*t == '-'
+	     ? Ustrspn(t+1, "0123456789") == len-1
+	     : Ustrspn(t,   "0123456789") == len)
       {
       boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
       /* expand_check_condition only does a literal string "0" check */