diff --git a/src/SimplifiedTranslatable.php b/src/SimplifiedTranslatable.php
index 074c9bf..15f59eb 100644
--- a/src/SimplifiedTranslatable.php
+++ b/src/SimplifiedTranslatable.php
@@ -3,9 +3,9 @@
 
 interface SimplifiedTranslatable
 {
-  public function _t($text, array $replacements = null, $choice = null): string;
+  public function _t($text, array $replacements = null, $choice = null);
 
-  public function _p($singular, $plural, int $n, array $replacements = null): string;
+  public function _p($singular, $plural, int $n, array $replacements = null);
 
-  public function _sp($simplePlural, int $n, array $replacements = null): string;
+  public function _sp($simplePlural, int $n, array $replacements = null);
 }
diff --git a/src/Translatable.php b/src/Translatable.php
index e4d5160..7d55a10 100644
--- a/src/Translatable.php
+++ b/src/Translatable.php
@@ -11,5 +11,5 @@ interface Translatable
    *
    * @return string
    */
-  public function _($msgId, $default, array $replacements = null, $choice = null): string;
+  public function _($msgId, $default, array $replacements = null, $choice = null);
 }
diff --git a/src/TranslatableTrait.php b/src/TranslatableTrait.php
index c90dfe1..941f1f0 100644
--- a/src/TranslatableTrait.php
+++ b/src/TranslatableTrait.php
@@ -14,17 +14,17 @@ abstract protected function _getTranslator(): Translator;
     '(o)'  => 'oes',
   ];
 
-  public function _($msgId, $default, array $replacements = null, $choice = null): string
+  public function _($msgId, $default, array $replacements = null, $choice = null)
   {
     return $this->_getTranslator()->_($msgId, $default, $replacements, $choice);
   }
 
-  public function _t($text, array $replacements = null, $choice = null): string
+  public function _t($text, array $replacements = null, $choice = null)
   {
     return $this->_getTranslator()->_(md5($text), $text, $replacements, $choice);
   }
 
-  public function _p($singular, $plural, int $n, array $replacements = null): string
+  public function _p($singular, $plural, int $n, array $replacements = null)
   {
     return $this->_getTranslator()->_(
       md5($singular . $plural),
@@ -41,7 +41,7 @@ public function _p($singular, $plural, int $n, array $replacements = null): stri
    *
    * @return mixed
    */
-  public function _sp($simplePlural, int $n, array $replacements = null): string
+  public function _sp($simplePlural, int $n, array $replacements = null)
   {
     return $this->_p(
       str_replace(array_keys(static::$replacements), '', $simplePlural),