diff --git a/.travis.yml b/.travis.yml
index 7d06b3a..edffa08 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -50,8 +50,8 @@ matrix:
                     local fold=$(date +%s%N)
                     echo -e "travis_fold:start:$fold"
                     echo -e "\\e[1;34m$title\\e[0m"
-                    echo "./tests/install.sh \"$1\" \"$2\" \"$3\""
-                    ./tests/install.sh "$1" "$2" "$3" 2>&1
+                    echo "./tests/install.sh \"$1\" \"$2\" \"$3\" \"$4\""
+                    ./tests/install.sh "$1" "$2" "$3" "$4" 2>&1
                     local ok=$?
                     (exit $ok) &&
                         echo -e "\\e[32mOK\\e[0m $title\\n\\ntravis_fold:end:$fold" ||
@@ -88,6 +88,8 @@ matrix:
               - install_test will-find "Http\Discovery\Psr17FactoryDiscovery::findRequestFactory();" "http-interop/http-factory-guzzle:1.*"
               # Test that we find PSR-17 nyholm
               - install_test will-find "Http\Discovery\Psr17FactoryDiscovery::findRequestFactory();" "nyholm/psr7:^1.3"
+              # Test that we find Phalcon with PSR
+              - install_test will-find "Http\Discovery\Psr17FactoryDiscovery::findRequestFactory();" "" "psr-1.0.0 phalcon-4.0.6"
 
 before_install:
     - if [[ $COVERAGE != true ]]; then phpenv config-rm xdebug.ini || true; fi
diff --git a/src/Strategy/CommonPsr17ClassesStrategy.php b/src/Strategy/CommonPsr17ClassesStrategy.php
index 7fd4ae0..2b7f845 100644
--- a/src/Strategy/CommonPsr17ClassesStrategy.php
+++ b/src/Strategy/CommonPsr17ClassesStrategy.php
@@ -21,6 +21,7 @@ final class CommonPsr17ClassesStrategy implements DiscoveryStrategy
      */
     private static $classes = [
         RequestFactoryInterface::class => [
+            'Phalcon\Http\Message\RequestFactory',
             'Nyholm\Psr7\Factory\Psr17Factory',
             'Zend\Diactoros\RequestFactory',
             'GuzzleHttp\Psr7\HttpFactory',
@@ -30,6 +31,7 @@ final class CommonPsr17ClassesStrategy implements DiscoveryStrategy
             'Laminas\Diactoros\RequestFactory',
         ],
         ResponseFactoryInterface::class => [
+            'Phalcon\Http\Message\ResponseFactory',
             'Nyholm\Psr7\Factory\Psr17Factory',
             'Zend\Diactoros\ResponseFactory',
             'GuzzleHttp\Psr7\HttpFactory',
@@ -39,6 +41,7 @@ final class CommonPsr17ClassesStrategy implements DiscoveryStrategy
             'Laminas\Diactoros\ResponseFactory',
         ],
         ServerRequestFactoryInterface::class => [
+            'Phalcon\Http\Message\ServerRequestFactory',
             'Nyholm\Psr7\Factory\Psr17Factory',
             'Zend\Diactoros\ServerRequestFactory',
             'GuzzleHttp\Psr7\HttpFactory',
@@ -48,6 +51,7 @@ final class CommonPsr17ClassesStrategy implements DiscoveryStrategy
             'Laminas\Diactoros\ServerRequestFactory',
         ],
         StreamFactoryInterface::class => [
+            'Phalcon\Http\Message\StreamFactory',
             'Nyholm\Psr7\Factory\Psr17Factory',
             'Zend\Diactoros\StreamFactory',
             'GuzzleHttp\Psr7\HttpFactory',
@@ -57,6 +61,7 @@ final class CommonPsr17ClassesStrategy implements DiscoveryStrategy
             'Laminas\Diactoros\StreamFactory',
         ],
         UploadedFileFactoryInterface::class => [
+            'Phalcon\Http\Message\UploadedFileFactory',
             'Nyholm\Psr7\Factory\Psr17Factory',
             'Zend\Diactoros\UploadedFileFactory',
             'GuzzleHttp\Psr7\HttpFactory',
@@ -66,6 +71,7 @@ final class CommonPsr17ClassesStrategy implements DiscoveryStrategy
             'Laminas\Diactoros\UploadedFileFactory',
         ],
         UriFactoryInterface::class => [
+            'Phalcon\Http\Message\UriFactory',
             'Nyholm\Psr7\Factory\Psr17Factory',
             'Zend\Diactoros\UriFactory',
             'GuzzleHttp\Psr7\HttpFactory',
diff --git a/tests/install.sh b/tests/install.sh
index 1f7480f..b1a6d4c 100755
--- a/tests/install.sh
+++ b/tests/install.sh
@@ -20,9 +20,14 @@ mkdir -p $BUILD_DIR
 composer init --working-dir $BUILD_DIR --no-interaction
 composer req --working-dir $BUILD_DIR php-http/discovery --no-update
 
-# Define packages from arguments
+# Argument 3 installs additional composer packages
 composer req --working-dir $BUILD_DIR $3
 
+# Arg 4 means some pecl things will be install
+if ! [ -z "$4" ]; then
+    pecl install $4
+fi
+
 # Copy the current version of php-http/discovery
 cp -R src $BUILD_DIR/vendor/php-http/discovery
 cd $BUILD_DIR