diff --git a/ext/standard/fsock.c b/ext/standard/fsock.c
index 9f7be328ce8..b59e9db8c24 100644
--- a/ext/standard/fsock.c
+++ b/ext/standard/fsock.c
@@ -52,7 +52,7 @@ static void php_fsockopen_stream(INTERNAL_FUNCTION_PARAMETERS, int persistent)
 	}
 
 	if (persistent) {
-		spprintf(&hashkey, 0, "pfsockopen__%s:%d", host, port);
+		spprintf(&hashkey, 0, "pfsockopen__%s:%ld", host, port);
 	}
 
 	if (port > 0) {