diff --git a/Zend/zend_operators.c b/Zend/zend_operators.c
index 1db18168564..b80b089e294 100644
--- a/Zend/zend_operators.c
+++ b/Zend/zend_operators.c
@@ -91,34 +91,6 @@ static const unsigned char tolower_map[256] = {
 		zend_binary_strncasecmp
  */
 
-ZEND_API int ZEND_FASTCALL zend_atoi(const char *str, size_t str_len) /* {{{ */
-{
-	int retval;
-
-	if (!str_len) {
-		str_len = strlen(str);
-	}
-	retval = ZEND_STRTOL(str, NULL, 0);
-	if (str_len>0) {
-		switch (str[str_len-1]) {
-			case 'g':
-			case 'G':
-				retval *= 1024;
-				ZEND_FALLTHROUGH;
-			case 'm':
-			case 'M':
-				retval *= 1024;
-				ZEND_FALLTHROUGH;
-			case 'k':
-			case 'K':
-				retval *= 1024;
-				break;
-		}
-	}
-	return retval;
-}
-/* }}} */
-
 ZEND_API zend_long ZEND_FASTCALL zend_atol(const char *str, size_t str_len) /* {{{ */
 {
 	zend_long retval;
diff --git a/Zend/zend_operators.h b/Zend/zend_operators.h
index 90df4b42fe5..f4dd47f58de 100644
--- a/Zend/zend_operators.h
+++ b/Zend/zend_operators.h
@@ -458,7 +458,6 @@ ZEND_API int ZEND_FASTCALL zend_compare_symbol_tables(HashTable *ht1, HashTable
 ZEND_API int ZEND_FASTCALL zend_compare_arrays(zval *a1, zval *a2);
 ZEND_API int ZEND_FASTCALL zend_compare_objects(zval *o1, zval *o2);
 
-ZEND_API int ZEND_FASTCALL zend_atoi(const char *str, size_t str_len);
 ZEND_API zend_long ZEND_FASTCALL zend_atol(const char *str, size_t str_len);
 
 #define convert_to_null_ex(zv) convert_to_null(zv)
diff --git a/ext/ffi/tests/bug78270_1.phpt b/ext/ffi/tests/bug78270_1.phpt
index 7544ccb5ebc..edc212bdd2c 100644
--- a/ext/ffi/tests/bug78270_1.phpt
+++ b/ext/ffi/tests/bug78270_1.phpt
@@ -2,6 +2,7 @@
 FR #78270 (Usage of __vectorcall convention with FFI)
 --EXTENSIONS--
 ffi
+zend_test
 --SKIPIF--
 <?php
 if (substr(PHP_OS, 0, 3) != 'WIN') die("skip this test is for Windows platforms only");
@@ -14,8 +15,8 @@ if (preg_match('/Compiler => .*clang.*/', $info)) die("skip not for clang");
 
 try {
     FFI::cdef(<<<EOC
-        __vectorcall int zend_atoi(const char *str, size_t str_len);
-        EOC, ffi_get_php_dll_name());
+        __vectorcall int bug78270(const char *str, size_t str_len);
+        EOC, "php_zend_test.dll");
 } catch (FFI\ParserException $ex) {
     die('skip __vectorcall not supported');
 }
@@ -24,9 +25,9 @@ try {
 <?php
 require_once('utils.inc');
 $ffi = FFI::cdef(<<<EOC
-    __vectorcall int zend_atoi(const char *str, size_t str_len);
-EOC, ffi_get_php_dll_name());
-var_dump($ffi->zend_atoi("17.4", 4));
+    __vectorcall int bug78270(const char *str, size_t str_len);
+EOC, "php_zend_test.dll");
+var_dump($ffi->bug78270("17.4", 4));
 ?>
 --EXPECT--
 int(17)
diff --git a/ext/ffi/tests/bug78270_2.phpt b/ext/ffi/tests/bug78270_2.phpt
index b454d277ea8..c17b143cf7d 100644
--- a/ext/ffi/tests/bug78270_2.phpt
+++ b/ext/ffi/tests/bug78270_2.phpt
@@ -2,6 +2,7 @@
 FR #78270 (Usage of __vectorcall convention with FFI)
 --EXTENSIONS--
 ffi
+zend_test
 --SKIPIF--
 <?php
 if (substr(PHP_OS, 0, 3) != 'WIN') die("skip this test is for Windows platforms only");
@@ -9,8 +10,8 @@ if (substr(PHP_OS, 0, 3) != 'WIN') die("skip this test is for Windows platforms
 require_once('utils.inc');
 try {
     FFI::cdef(<<<EOC
-        __vectorcall int zend_atoi(const char *str, size_t str_len);
-        EOC, ffi_get_php_dll_name());
+        __vectorcall int bug78270(const char *str, size_t str_len);
+        EOC, "php_zend_test.dll");
 } catch (FFI\ParserException $ex) {
     die('skip __vectorcall not supported');
 }
diff --git a/ext/zend_test/php_test.h b/ext/zend_test/php_test.h
index e16129d7ee4..c848dd3d76a 100644
--- a/ext/zend_test/php_test.h
+++ b/ext/zend_test/php_test.h
@@ -67,6 +67,8 @@ struct bug79096 {
 #	define PHP_ZEND_TEST_API
 #endif
 
+PHP_ZEND_TEST_API int ZEND_FASTCALL bug78270(const char *str, size_t str_len);
+
 PHP_ZEND_TEST_API struct bug79096 bug79096(void);
 PHP_ZEND_TEST_API void bug79532(off_t *array, size_t elems);
 
diff --git a/ext/zend_test/test.c b/ext/zend_test/test.c
index 0fc76b149f2..27f9ee538b5 100644
--- a/ext/zend_test/test.c
+++ b/ext/zend_test/test.c
@@ -469,6 +469,12 @@ ZEND_TSRMLS_CACHE_DEFINE()
 ZEND_GET_MODULE(zend_test)
 #endif
 
+/* The important part here is the ZEND_FASTCALL. */
+PHP_ZEND_TEST_API int ZEND_FASTCALL bug78270(const char *str, size_t str_len)
+{
+	return (int) zend_atol(str, str_len);
+}
+
 PHP_ZEND_TEST_API struct bug79096 bug79096(void)
 {
 	struct bug79096 b;
diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
index a9b8d36fa87..483d2e86dbd 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -1278,7 +1278,7 @@ static PHP_INI_MH(OnUpdate_zlib_output_compression)
 	} else if (zend_string_equals_literal_ci(new_value, "on")) {
 		int_value = 1;
 	} else {
-		int_value = zend_atoi(ZSTR_VAL(new_value), ZSTR_LEN(new_value));
+		int_value = (int) zend_atol(ZSTR_VAL(new_value), ZSTR_LEN(new_value));
 	}
 	ini_value = zend_ini_string("output_handler", sizeof("output_handler"), 0);