diff --git a/internal/ejbca/client.go b/internal/ejbca/client.go
index c97163a..897cde3 100644
--- a/internal/ejbca/client.go
+++ b/internal/ejbca/client.go
@@ -183,5 +183,5 @@ func (s *signer) parseEjbcaError(ctx context.Context, detail string, err error)
 
 	logger.Error(err, "EJBCA returned an error")
 
-	return fmt.Errorf(errString)
+	return errors.New(errString)
 }
diff --git a/internal/est/est.go b/internal/est/est.go
index 9e286b6..8c9c83a 100644
--- a/internal/est/est.go
+++ b/internal/est/est.go
@@ -193,7 +193,7 @@ func (e *client) CaCerts(alias string) ([]*x509.Certificate, error) {
 		if len(content) > 0 {
 			errMsg = fmt.Sprintf("unexpected content-type: %s", content[0])
 		}
-		return nil, fmt.Errorf(errMsg)
+		return nil, errors.New(errMsg)
 	}
 
 	// Ensure that the response is base64 encoded
@@ -203,7 +203,7 @@ func (e *client) CaCerts(alias string) ([]*x509.Certificate, error) {
 		if len(encoding) > 0 {
 			errMsg = fmt.Sprintf("unexpected content-transfer-encoding: %s", encoding[0])
 		}
-		return nil, fmt.Errorf(errMsg)
+		return nil, errors.New(errMsg)
 	}
 
 	e.logger.Info("Validated HTTP response headers")