diff --git a/challenge/http01/http_challenge.go b/challenge/http01/http_challenge.go
index be113ed4..e6cc0d1b 100644
--- a/challenge/http01/http_challenge.go
+++ b/challenge/http01/http_challenge.go
@@ -56,7 +56,7 @@ func (c *Challenge) Solve(authz acme.Authorization) error {
 	defer func() {
 		err := c.provider.CleanUp(authz.Identifier.Value, chlng.Token, keyAuth)
 		if err != nil {
-			log.Warnf("[%s] acme: error cleaning up: %v", domain, err)
+			log.Warnf("[%s] acme: cleaning up failed: %v", domain, err)
 		}
 	}()
 
diff --git a/challenge/resolver/prober.go b/challenge/resolver/prober.go
index ab45afb6..d3c71e8d 100644
--- a/challenge/resolver/prober.go
+++ b/challenge/resolver/prober.go
@@ -167,7 +167,7 @@ func cleanUp(solvr solver, authz acme.Authorization) {
 		domain := challenge.GetTargetedDomain(authz)
 		err := solvr.CleanUp(authz)
 		if err != nil {
-			log.Warnf("[%s] acme: error cleaning up: %v ", domain, err)
+			log.Warnf("[%s] acme: cleaning up failed: %v ", domain, err)
 		}
 	}
 }
diff --git a/challenge/tlsalpn01/tls_alpn_challenge.go b/challenge/tlsalpn01/tls_alpn_challenge.go
index 231078eb..348e5e92 100644
--- a/challenge/tlsalpn01/tls_alpn_challenge.go
+++ b/challenge/tlsalpn01/tls_alpn_challenge.go
@@ -62,7 +62,7 @@ func (c *Challenge) Solve(authz acme.Authorization) error {
 	defer func() {
 		err := c.provider.CleanUp(domain, chlng.Token, keyAuth)
 		if err != nil {
-			log.Warnf("[%s] acme: error cleaning up: %v", challenge.GetTargetedDomain(authz), err)
+			log.Warnf("[%s] acme: cleaning up failed: %v", challenge.GetTargetedDomain(authz), err)
 		}
 	}()