diff --git a/checker/checker.go b/checker/checker.go
index df1eb19..909a498 100644
--- a/checker/checker.go
+++ b/checker/checker.go
@@ -447,7 +447,7 @@ func check_matrix_federation(domain string) (version string, err error) {
 
 	var federationTest matrix_result
 	if err = json.NewDecoder(resp.Body).Decode(&federationTest); err != nil {
-		log.Printf("Error in check_matrix_federation, when decoding json: %w", err.Error())
+		log.Printf("Error in check_matrix_federation, when decoding json: %s", err.Error())
 		return "", fmt.Errorf("Sorry, the federation tester is broken. Check on https://federationtester.matrix.org/#%s", strings.TrimSuffix(domain, "."))
 	} else if federationTest.FederationOK {
 		version = federationTest.Version.Name + " " + federationTest.Version.Version
@@ -499,7 +499,7 @@ func check_matrix_client(domain string) (version string, err error) {
 	if resp.StatusCode < 300 {
 		var wellknown matrix_wk_client
 		if err = json.NewDecoder(resp.Body).Decode(&wellknown); err != nil {
-			log.Printf("Error in check_matrix_client, when decoding json: %w", err.Error())
+			log.Printf("Error in check_matrix_client, when decoding json: %s", err.Error())
 			return "", fmt.Errorf("File at https://%s/.well-known/matrix/client is invalid: JSON parse error", strings.TrimSuffix(domain, "."))
 		} else if wellknown.Homeserver.BaseURL != "" {
 			if baseurl, err := url.Parse(wellknown.Homeserver.BaseURL); err != nil {
@@ -528,7 +528,7 @@ func check_matrix_client(domain string) (version string, err error) {
 
 	var clientTest matrix_client_versions
 	if err = json.NewDecoder(resp2.Body).Decode(&clientTest); err != nil {
-		log.Printf("Error in check_matrix_client, when decoding versions json: %w", err.Error())
+		log.Printf("Error in check_matrix_client, when decoding versions json: %s", err.Error())
 		return "", fmt.Errorf("File at %s/_matrix/client/versions is invalid: JSON parse error: %s", HomeserverBase, err.Error())
 	} else if len(clientTest.Versions) == 0 {
 		return "", fmt.Errorf("File at %s/_matrix/client/versions is invalid: no protocol version supported", HomeserverBase)
diff --git a/checker/main.go b/checker/main.go
index 123a9f8..5663cc2 100644
--- a/checker/main.go
+++ b/checker/main.go
@@ -37,7 +37,7 @@ func main() {
 		// Check one or more students and exit
 		for _, std_login := range flag.Args() {
 			if verbose {
-				log.Println("==============================\n")
+				log.Printf("==============================\n\n")
 			}
 
 			if std, err := adlin.GetStudentByLogin(std_login); err != nil {