diff --git a/src/Instrumentation/Psr18/src/Psr18Instrumentation.php b/src/Instrumentation/Psr18/src/Psr18Instrumentation.php
index 0be3127aa..bf78917ce 100644
--- a/src/Instrumentation/Psr18/src/Psr18Instrumentation.php
+++ b/src/Instrumentation/Psr18/src/Psr18Instrumentation.php
@@ -49,6 +49,7 @@ public static function register(): void
                     ->spanBuilder(sprintf('%s', $request->getMethod()))
                     ->setParent($parentContext)
                     ->setSpanKind(SpanKind::KIND_CLIENT)
+                    ->setAttribute(TraceAttributes::PEER_SERVICE, $request->getUri()->getHost())
                     ->setAttribute(TraceAttributes::URL_FULL, (string) $request->getUri())
                     ->setAttribute(TraceAttributes::HTTP_REQUEST_METHOD, $request->getMethod())
                     ->setAttribute(TraceAttributes::NETWORK_PROTOCOL_VERSION, $request->getProtocolVersion())
diff --git a/src/Instrumentation/Psr18/tests/Integration/Psr18InstrumentationTest.php b/src/Instrumentation/Psr18/tests/Integration/Psr18InstrumentationTest.php
index f00e9d17f..bd12e33f5 100644
--- a/src/Instrumentation/Psr18/tests/Integration/Psr18InstrumentationTest.php
+++ b/src/Instrumentation/Psr18/tests/Integration/Psr18InstrumentationTest.php
@@ -80,6 +80,8 @@ public function test_send_request(string $method, string $uri, int $statusCode):
         $span = $this->storage[0];
 
         $this->assertStringContainsString($method, $span->getName());
+        $this->assertTrue($span->getAttributes()->has(TraceAttributes::PEER_SERVICE));
+        $this->assertSame(parse_url($uri)['host'] ?? null, $span->getAttributes()->get(TraceAttributes::PEER_SERVICE));
         $this->assertTrue($span->getAttributes()->has(TraceAttributes::URL_FULL));
         $this->assertSame($uri, $span->getAttributes()->get(TraceAttributes::URL_FULL));
         $this->assertTrue($span->getAttributes()->has(TraceAttributes::HTTP_REQUEST_METHOD));