diff --git a/src/Config/ValueTypes.php b/src/Config/ValueTypes.php
index 5e7cefca9..77a815b03 100644
--- a/src/Config/ValueTypes.php
+++ b/src/Config/ValueTypes.php
@@ -132,4 +132,5 @@ interface ValueTypes
     public const OTEL_PHP_DISABLED_INSTRUMENTATIONS = VariableTypes::LIST;
     public const OTEL_PHP_DEBUG_SCOPES_DISABLED = VariableTypes::BOOL;
     public const OTEL_PHP_EXCLUDED_URLS = VariableTypes::LIST;
+    public const OTEL_PHP_FIBERS_ENABLED = VariableTypes::BOOL;
 }
diff --git a/src/Config/Variables.php b/src/Config/Variables.php
index 41129e455..ee8a820e5 100644
--- a/src/Config/Variables.php
+++ b/src/Config/Variables.php
@@ -141,4 +141,5 @@ interface Variables
     public const OTEL_PHP_DEBUG_SCOPES_DISABLED = 'OTEL_PHP_DEBUG_SCOPES_DISABLED';
     public const OTEL_PHP_DISABLED_INSTRUMENTATIONS = 'OTEL_PHP_DISABLED_INSTRUMENTATIONS';
     public const OTEL_PHP_EXCLUDED_URLS = 'OTEL_PHP_EXCLUDED_URLS';
+    public const OTEL_PHP_FIBERS_ENABLED = 'OTEL_PHP_FIBERS_ENABLED';
 }
diff --git a/src/Context/ZendObserverFiber.php b/src/Context/ZendObserverFiber.php
index 4d3d0c5ef..e9ac847a7 100644
--- a/src/Context/ZendObserverFiber.php
+++ b/src/Context/ZendObserverFiber.php
@@ -11,9 +11,8 @@
 
 use function extension_loaded;
 use FFI;
-use const FILTER_VALIDATE_BOOLEAN;
-use function filter_var;
-use function is_string;
+use OpenTelemetry\Config\Configuration;
+use OpenTelemetry\Config\Variables;
 use const PHP_VERSION_ID;
 use const PHP_ZTS;
 use function sprintf;
@@ -26,11 +25,7 @@ final class ZendObserverFiber
 {
     public static function isEnabled(): bool
     {
-        $enabled = $_SERVER['OTEL_PHP_FIBERS_ENABLED'] ?? false;
-
-        return is_string($enabled)
-            ? filter_var($enabled, FILTER_VALIDATE_BOOLEAN)
-            : (bool) $enabled;
+        return Configuration::getBoolean(Variables::OTEL_PHP_FIBERS_ENABLED, false);
     }
 
     public static function init(): bool
diff --git a/tests/Integration/Context/Fiber/test_context_switching_ffi_observer.phpt b/tests/Integration/Context/Fiber/test_context_switching_ffi_observer.phpt
index f6ce0eb81..90acc2f86 100644
--- a/tests/Integration/Context/Fiber/test_context_switching_ffi_observer.phpt
+++ b/tests/Integration/Context/Fiber/test_context_switching_ffi_observer.phpt
@@ -3,7 +3,7 @@ Context switches on execution context switch.
 --SKIPIF--
 <?php if (PHP_VERSION_ID < 80100 || !extension_loaded('ffi')) die('skip requires PHP8.1 and FFI'); ?>
 --ENV--
-OTEL_PHP_FIBERS_ENABLED=1
+OTEL_PHP_FIBERS_ENABLED=true
 --FILE--
 <?php
 use OpenTelemetry\Context\Context;
diff --git a/tests/Integration/Context/Fiber/test_context_switching_ffi_observer_registered_on_startup.phpt b/tests/Integration/Context/Fiber/test_context_switching_ffi_observer_registered_on_startup.phpt
index cce2314d5..cddb55f7a 100644
--- a/tests/Integration/Context/Fiber/test_context_switching_ffi_observer_registered_on_startup.phpt
+++ b/tests/Integration/Context/Fiber/test_context_switching_ffi_observer_registered_on_startup.phpt
@@ -3,7 +3,7 @@ Fiber handler has to be loaded before fibers are used.
 --SKIPIF--
 <?php if (PHP_VERSION_ID < 80100 || !extension_loaded('ffi')) die('skip requires PHP8.1 and FFI'); ?>
 --ENV--
-OTEL_PHP_FIBERS_ENABLED=1
+OTEL_PHP_FIBERS_ENABLED=true
 --FILE--
 <?php
 use OpenTelemetry\Context\Context;
diff --git a/tests/Integration/Context/Fiber/test_context_switching_not_supported.phpt b/tests/Integration/Context/Fiber/test_context_switching_not_supported.phpt
index b30779b84..cac9fdb7c 100644
--- a/tests/Integration/Context/Fiber/test_context_switching_not_supported.phpt
+++ b/tests/Integration/Context/Fiber/test_context_switching_not_supported.phpt
@@ -3,7 +3,7 @@ Context usage in fiber without fiber support triggers warning.
 --SKIPIF--
 <?php if (!class_exists(Fiber::class)) die('skip requires fibers'); ?>
 --ENV--
-OTEL_PHP_FIBERS_ENABLED=0
+OTEL_PHP_FIBERS_ENABLED=false
 --FILE--
 <?php
 use OpenTelemetry\Context\Context;