diff --git a/README.md b/README.md
index 7a30ec15..5ee4d8e5 100644
--- a/README.md
+++ b/README.md
@@ -149,7 +149,7 @@ You should use the [`Factory`](#factory) to automatically create a new instance.
Advanced! If you explicitly need a certain event loop implementation, you can
manually instantiate one of the following classes.
Note that you may have to install the required PHP extensions for the respective
-event loop implementation first or this may result in a fatal error.
+event loop implementation first or they will throw a `BadMethodCallException` on creation.
#### StreamSelectLoop
diff --git a/src/ExtEventLoop.php b/src/ExtEventLoop.php
index 4582a38a..622dd472 100644
--- a/src/ExtEventLoop.php
+++ b/src/ExtEventLoop.php
@@ -2,6 +2,7 @@
namespace React\EventLoop;
+use BadMethodCallException;
use Event;
use EventBase;
use EventConfig as EventBaseConfig;
@@ -38,6 +39,10 @@ final class ExtEventLoop implements LoopInterface
public function __construct()
{
+ if (!class_exists('EventBase', false)) {
+ throw new BadMethodCallException('Cannot create ExtEventLoop, ext-event extension missing');
+ }
+
$config = new EventBaseConfig();
$config->requireFeatures(EventBaseConfig::FEATURE_FDS);
diff --git a/src/ExtLibevLoop.php b/src/ExtLibevLoop.php
index 9c679895..d3b0df81 100644
--- a/src/ExtLibevLoop.php
+++ b/src/ExtLibevLoop.php
@@ -2,6 +2,7 @@
namespace React\EventLoop;
+use BadMethodCallException;
use libev\EventLoop;
use libev\IOEvent;
use libev\SignalEvent;
@@ -36,6 +37,10 @@ final class ExtLibevLoop implements LoopInterface
public function __construct()
{
+ if (!class_exists('libev\EventLoop', false)) {
+ throw new BadMethodCallException('Cannot create ExtLibevLoop, ext-libev extension missing');
+ }
+
$this->loop = new EventLoop();
$this->futureTickQueue = new FutureTickQueue();
$this->timerEvents = new SplObjectStorage();
diff --git a/src/ExtLibeventLoop.php b/src/ExtLibeventLoop.php
index 5bc265e2..427f8db0 100644
--- a/src/ExtLibeventLoop.php
+++ b/src/ExtLibeventLoop.php
@@ -2,6 +2,7 @@
namespace React\EventLoop;
+use BadMethodCallException;
use Event;
use EventBase;
use React\EventLoop\Tick\FutureTickQueue;
@@ -52,6 +53,10 @@ final class ExtLibeventLoop implements LoopInterface
public function __construct()
{
+ if (!function_exists('event_base_new')) {
+ throw new BadMethodCallException('Cannot create ExtLibeventLoop, ext-libevent extension missing');
+ }
+
$this->eventBase = event_base_new();
$this->futureTickQueue = new FutureTickQueue();
$this->timerEvents = new SplObjectStorage();
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