diff --git a/doc/api/assert.md b/doc/api/assert.md
index 4847bbf86dda68..4958e6dd7df474 100644
--- a/doc/api/assert.md
+++ b/doc/api/assert.md
@@ -351,8 +351,6 @@ const tracker = new assert.CallTracker();
 
 function func() {}
 
-function foo() {}
-
 // Returns a function that wraps func() that must be called exact times
 // before tracker.verify().
 const callsfunc = tracker.calls(func, 2);
@@ -379,8 +377,6 @@ const tracker = new assert.CallTracker();
 
 function func() {}
 
-function foo() {}
-
 // Returns a function that wraps func() that must be called exact times
 // before tracker.verify().
 const callsfunc = tracker.calls(func, 2);