diff --git a/src/Health/Checks/EnvVars.php b/src/Health/Checks/EnvVars.php
index eed5661..ae52243 100755
--- a/src/Health/Checks/EnvVars.php
+++ b/src/Health/Checks/EnvVars.php
@@ -186,7 +186,8 @@ protected function missingVars(Collection $vars): Collection
 
         $vars->each(function (string $name) use ($missingVars) {
             $value = env($name);
-            if (! $value) {
+
+            if ($value === null) {
                 $missingVars->push($name);
             }
         });
diff --git a/tests/EnvVarsTest.php b/tests/EnvVarsTest.php
index 2ebe5f9..89a609d 100644
--- a/tests/EnvVarsTest.php
+++ b/tests/EnvVarsTest.php
@@ -3,6 +3,10 @@
 use Encodia\Health\Checks\EnvVars;
 use Spatie\Health\Enums\Status;
 
+afterEach(function () {
+    unsetEnvVars(['VAR1', 'VAR2', 'VAR3', 'VAR4', 'ENV_VAR1', 'ENV_VAR2', 'ENV_PROD_VAR1']);
+});
+
 it('returns ok when no variable names have been provided', function () {
     $result = EnvVars::new()->run();
 
@@ -40,16 +44,33 @@
         ->shortSummary->toBe(trans('health-env-vars::translations.every_var_has_been_set'));
 });
 
+it('returns ok when a boolean variable is initialized to false', function () {
+    initEnvVars([
+        'ENV_VAR1' => false,
+    ]);
+
+    $result = EnvVars::new()
+        ->requireVars([
+            'ENV_VAR1',
+        ])
+        ->run();
+
+    expect($result)
+        ->status->toBe(Status::ok())
+        ->shortSummary->toBe(trans('health-env-vars::translations.every_var_has_been_set'));
+});
+
 it('returns an error when not every provided name matches a .env variable with a non-empty value', function () {
     $missingList = ['ENV_VAR1'];
 
-    // GIVEN some .env variables which has been initialized with a non-empty value and one variable which has an
-    // empty value
+    // GIVEN one .env variable which has been initialized with a non-empty value and one variable which has not
+    // been declared
     initEnvVars([
-        'ENV_VAR1' => '',
         'ENV_VAR2' => 'bar',
     ]);
 
+    expect(env('ENV_VAR1'))->toBeNull();
+
     $result = EnvVars::new()
         ->requireVars([
             'ENV_VAR1',
diff --git a/tests/MultipleEnvironmentTest.php b/tests/MultipleEnvironmentTest.php
index 2f40c08..d5e2c6c 100644
--- a/tests/MultipleEnvironmentTest.php
+++ b/tests/MultipleEnvironmentTest.php
@@ -62,7 +62,7 @@ function () {
         // ensure code is running in an environment different from the one we're testing that a var has been set
         expect(currentEnvironment())->not->toEqual($specificEnvironment);
         // ensure in the current environment the given var has not been set
-        initEnvVars([$varName => null]);
+        expect(env($varName))->toBeNull();
 
         // WHEN switching to the desired environment...
         mockCurrentEnvironment(ENVIRONMENT_PRODUCTION);