diff --git a/pep-0558.rst b/pep-0558.rst
index 8f43ab32a..11bab032e 100644
--- a/pep-0558.rst
+++ b/pep-0558.rst
@@ -219,7 +219,7 @@ The current cause of CPython's tracing mode quirks (both the side effects from
 simply installing a tracing function and the fact that writing values back to
 function locals only works for the specific function being traced) is the way
 that locals mutation support for trace hooks is currently implemented: the
-``PyFrame_FastToLocals`` function.
+``PyFrame_LocalsToFast`` function.
 
 When a trace function is installed, CPython currently does the following for
 function frames (those where the code object uses "fast locals" semantics):