diff --git a/harbor-ctl.py b/harbor-ctl.py
index 64f733c..29a2dec 100755
--- a/harbor-ctl.py
+++ b/harbor-ctl.py
@@ -272,7 +272,7 @@ def cmd_vulns(args, user, password, url):
             sev = v.get("severity", "Unknown")
             summary[sev] = summary.get(sev, 0) + 1
 
-        print(f"Summary: ", end="")
+        print("Summary: ", end="")
         for sev in ["Critical", "High", "Medium", "Low"]:
             if sev in summary:
                 print(f"{sev}: {summary[sev]}  ", end="")