diff --git a/common/stringz/stringz.go b/common/stringz/stringz.go
index 6cc889ce6..5033e1cb0 100644
--- a/common/stringz/stringz.go
+++ b/common/stringz/stringz.go
@@ -83,6 +83,14 @@ func AddURLDefaultPort(rawURL string) string {
 	if err != nil {
 		return rawURL
 	}
+	// Force default port to be added if not present
+	if u.Port() == "" {
+		if u.Scheme == urlutil.HTTP {
+			u.UpdatePort("80")
+		} else if u.Scheme == urlutil.HTTPS {
+			u.UpdatePort("443")
+		}
+	}
 	return u.String()
 }
 
diff --git a/runner/runner.go b/runner/runner.go
index 2035199aa..15dbb627a 100644
--- a/runner/runner.go
+++ b/runner/runner.go
@@ -1723,7 +1723,11 @@ retry:
 	}
 
 	builder := &strings.Builder{}
-	builder.WriteString(stringz.RemoveURLDefaultPort(fullURL))
+	if scanopts.LeaveDefaultPorts {
+		builder.WriteString(stringz.AddURLDefaultPort(fullURL))
+	} else {
+		builder.WriteString(stringz.RemoveURLDefaultPort(fullURL))
+	}
 
 	if r.options.Probe {
 		builder.WriteString(" [")