Implement PEP 393.
diff --git a/Objects/stringlib/count.h b/Objects/stringlib/count.h
index de34f96..f48500b 100644
--- a/Objects/stringlib/count.h
+++ b/Objects/stringlib/count.h
@@ -1,14 +1,11 @@
 /* stringlib: count implementation */
 
-#ifndef STRINGLIB_COUNT_H
-#define STRINGLIB_COUNT_H
-
 #ifndef STRINGLIB_FASTSEARCH_H
 #error must include "stringlib/fastsearch.h" before including this module
 #endif
 
 Py_LOCAL_INLINE(Py_ssize_t)
-stringlib_count(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
+STRINGLIB(count)(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
                 const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
                 Py_ssize_t maxcount)
 {
@@ -19,7 +16,7 @@
     if (sub_len == 0)
         return (str_len < maxcount) ? str_len + 1 : maxcount;
 
-    count = fastsearch(str, str_len, sub, sub_len, maxcount, FAST_COUNT);
+    count = FASTSEARCH(str, str_len, sub, sub_len, maxcount, FAST_COUNT);
 
     if (count < 0)
         return 0; /* no match */
@@ -27,4 +24,4 @@
     return count;
 }
 
-#endif
+