diff --git a/src/fastmcp/utilities/http.py b/src/fastmcp/utilities/http.py
index 22c165735..c1237d62e 100644
--- a/src/fastmcp/utilities/http.py
+++ b/src/fastmcp/utilities/http.py
@@ -3,6 +3,6 @@ import socket
 
 def find_available_port() -> int:
     """Find an available port by letting the OS assign one."""
-    with socket.socket() as s:
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
         s.bind(("127.0.0.1", 0))
         return s.getsockname()[1]