diff --git a/tests/Zend/Validate/FloatTest.php b/tests/Zend/Validate/FloatTest.php
index 52194bc6e..bb5245afb 100644
--- a/tests/Zend/Validate/FloatTest.php
+++ b/tests/Zend/Validate/FloatTest.php
@@ -185,7 +185,8 @@ public function testPhpLocaleDeFloatType()
      */
     public function testPhpLocaleFrFloatType()
     {
-        $locale = setlocale(LC_ALL, 'fr');
+        $locale = setlocale(LC_ALL, 0);
+        setlocale(LC_ALL, 'fr');
         $valid = new Zend_Validate_Float();
         $isValid = $valid->isValid(10.5);
         setlocale(LC_ALL, $locale);
@@ -197,8 +198,10 @@ public function testPhpLocaleFrFloatType()
      */
     public function testPhpLocaleDeStringType()
     {
-        $lcAll = setlocale(LC_ALL, 'de_AT');
-        $lcNumeric = setlocale(LC_NUMERIC, 'de_AT');
+        $lcAll = setlocale(LC_ALL, 0);
+        setlocale(LC_ALL, 'de_AT');
+        $lcNumeric = setlocale(LC_NUMERIC, 0);
+        setlocale(LC_NUMERIC, 'de_AT');
         $valid = new Zend_Validate_Float('de_AT');
         $isValid0 = $valid->isValid('1,3');
         $isValid1 = $valid->isValid('1000,3');