diff --git a/drivers/eprover.drv b/drivers/eprover.drv
index 7bbf2f14324bbb684b698b463e66a6764c34ec9e..60d57413809b2af0236c71ccd95b0a4587250035 100644
--- a/drivers/eprover.drv
+++ b/drivers/eprover.drv
@@ -5,7 +5,7 @@ invalid "Completion found"
 timeout "Ran out of time"
 timeout "CPU time limit exceeded"
 outofmemory "Out of Memory"
-unknown "No Proof Found" ""
+unknown "No proof found" ""
 fail    "Failure.*"                   "\"\\0\""
 time "why3cpulimit time : %s s"