diff --git a/Include/pystrtod.h b/Include/pystrtod.h
index d7bae12..23fd1c6 100644
--- a/Include/pystrtod.h
+++ b/Include/pystrtod.h
@@ -18,7 +18,9 @@
                                          int flags,
                                          int *type);
 
+#ifndef Py_LIMITED_API
 PyAPI_FUNC(double) _Py_parse_inf_or_nan(const char *p, char **endptr);
+#endif
 
 
 /* PyOS_double_to_string's "flags" parameter can be set to 0 or more of: */