diff --git a/tools/funclatency.py b/tools/funclatency.py
index 13c18de..bfaa4be 100755
--- a/tools/funclatency.py
+++ b/tools/funclatency.py
@@ -201,9 +201,10 @@
     b.attach_kretprobe(event_re=pattern, fn_name="trace_func_return")
     matched = b.num_open_kprobes()
 else:
-    b.attach_uprobe(name=library, sym_re=pattern, fn_name="trace_func_entry")
+    b.attach_uprobe(name=library, sym_re=pattern, fn_name="trace_func_entry",
+                    pid=args.pid or -1)
     b.attach_uretprobe(name=library, sym_re=pattern,
-                       fn_name="trace_func_return")
+                       fn_name="trace_func_return", pid=args.pid or -1)
     matched = b.num_open_uprobes()
 
 if matched == 0: