diff --git a/phpdoc.php b/phpdoc.php
index e5f5270902..7136f00e08 100644
--- a/phpdoc.php
+++ b/phpdoc.php
@@ -23,6 +23,7 @@
 $carbon = __DIR__.'/src/Carbon/Carbon.php';
 $immutable = __DIR__.'/src/Carbon/CarbonImmutable.php';
 $interface = __DIR__.'/src/Carbon/CarbonInterface.php';
+$phpLevel = 7.1;
 file_put_contents($interface, preg_replace('/(\/\/ <methods[\s\S]*>)([\s\S]+)(<\/methods>)/mU', "$1\n\n    // $3", file_get_contents($interface), 1));
 require_once __DIR__.'/vendor/autoload.php';
 $trait = __DIR__.'/src/Carbon/Traits/Date.php';
@@ -582,6 +583,10 @@ function compileDoc($autoDocLines, $file)
                 '     */';
         }
 
+        if (strpos($return, 'self') !== false && $phpLevel < 7.4) {
+            $return = '';
+        }
+
         $methods .= "\n$methodDocBlock\n    public$static function $method($parameters)$return;";
     }
 }
diff --git a/src/Carbon/CarbonInterface.php b/src/Carbon/CarbonInterface.php
index e36c6bc0ae..7aa1df4c88 100644
--- a/src/Carbon/CarbonInterface.php
+++ b/src/Carbon/CarbonInterface.php
@@ -1243,7 +1243,7 @@ public static function createSafe($year = null, $month = null, $day = null, $hou
      *
      * @return static
      */
-    public static function createStrict(?int $year = 0, ?int $month = 1, ?int $day = 1, ?int $hour = 0, ?int $minute = 0, ?int $second = 0, $tz = null): self;
+    public static function createStrict(?int $year = 0, ?int $month = 1, ?int $day = 1, ?int $hour = 0, ?int $minute = 0, ?int $second = 0, $tz = null);
 
     /**
      * Get/set the day of year.