diff --git a/src/testdir/test55.in b/src/testdir/test55.in
index 2243762..7d0008e 100644
--- a/src/testdir/test55.in
+++ b/src/testdir/test55.in
@@ -146,7 +146,7 @@
 :try
 :  let n = d[1500]
 :catch
-:  $put =v:exception[:14] . v:exception[-4:-1]
+:  $put =substitute(v:exception, '\v(.{14}).*( \d{4}).*', '\1\2', '')
 :endtry
 :" lookup each items
 :for i in range(1500)