tools/examples: hardcode #!/usr/bin/python shebang
diff --git a/tools/offwaketime.py b/tools/offwaketime.py
index 3c4f0f3..38a9ff2 100755
--- a/tools/offwaketime.py
+++ b/tools/offwaketime.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python
 #
 # offwaketime   Summarize blocked time by kernel off-CPU stack + waker stack
 #               For Linux, uses BCC, eBPF.