diff --git a/backend/internal/service/project/service.go b/backend/internal/service/project/service.go
index c2c94b3ccb..a1d7fe54e1 100644
--- a/backend/internal/service/project/service.go
+++ b/backend/internal/service/project/service.go
@@ -739,9 +739,12 @@ func defaultProjectID(path string) domain.ProjectID {
 	id := strings.ToLower(filepath.Base(path))
 	id = strings.TrimSpace(id)
 	id = strings.ReplaceAll(id, " ", "-")
+	id = nonAlphanumeric.ReplaceAllString(id, "-")
 	return domain.ProjectID(id)
 }
 
+var nonAlphanumeric = regexp.MustCompile(`[^a-zA-Z0-9_-]+`)
+
 var projectIDPattern = regexp.MustCompile(`^[A-Za-z0-9][A-Za-z0-9._-]*$`)
 
 func validateProjectID(id domain.ProjectID) error {