diff --git a/tools/cachetop.py b/tools/cachetop.py
index 803e2a0..fe6a9a9 100755
--- a/tools/cachetop.py
+++ b/tools/cachetop.py
@@ -157,8 +157,8 @@
         u32 uid = bpf_get_current_uid_gid();
 
         key.ip = PT_REGS_IP(ctx);
-        key.pid = pid & 0xFFFFFFFF;
-        key.uid = uid & 0xFFFFFFFF;
+        key.pid = pid >> 32;
+        key.uid = uid;
         bpf_get_current_comm(&(key.comm), 16);
 
         counts.increment(key);