diff --git a/instrumentation/excon/test/opentelemetry/instrumentation/excon/instrumentation_test.rb b/instrumentation/excon/test/opentelemetry/instrumentation/excon/instrumentation_test.rb
index a70228463..4301f853a 100644
--- a/instrumentation/excon/test/opentelemetry/instrumentation/excon/instrumentation_test.rb
+++ b/instrumentation/excon/test/opentelemetry/instrumentation/excon/instrumentation_test.rb
@@ -215,6 +215,8 @@
     end
 
     it 'emits span on connect' do
+      port = nil
+
       TCPServer.open('localhost', 0) do |server|
         Thread.start do
           server.accept
@@ -231,6 +233,7 @@
       _(span.name).must_equal 'connect'
       _(span.attributes['net.peer.name']).must_equal('localhost')
       _(span.attributes['net.peer.port']).wont_be_nil
+      _(span.attributes['net.peer.port']).must_equal(port)
 
       assert_http_spans(target: '/example', exception: 'Excon::Error::Timeout')
     end
diff --git a/instrumentation/http/test/instrumentation/http/patches/connection_test.rb b/instrumentation/http/test/instrumentation/http/patches/connection_test.rb
index fc0b2b2a4..fe7e1caa1 100644
--- a/instrumentation/http/test/instrumentation/http/patches/connection_test.rb
+++ b/instrumentation/http/test/instrumentation/http/patches/connection_test.rb
@@ -24,6 +24,8 @@
 
   describe '#connect' do
     it 'emits span on connect' do
+      port = nil
+
       WebMock.allow_net_connect!
       TCPServer.open('localhost', 0) do |server|
         Thread.start { server.accept }
@@ -38,6 +40,7 @@
       _(span.name).must_equal 'HTTP CONNECT'
       _(span.attributes['net.peer.name']).must_equal('localhost')
       _(span.attributes['net.peer.port']).wont_be_nil
+      _(span.attributes['net.peer.port']).must_equal(port)
     ensure
       WebMock.disable_net_connect!
     end
diff --git a/instrumentation/net_http/test/opentelemetry/instrumentation/net/http/instrumentation_test.rb b/instrumentation/net_http/test/opentelemetry/instrumentation/net/http/instrumentation_test.rb
index fb4d61a92..0d7b162b7 100644
--- a/instrumentation/net_http/test/opentelemetry/instrumentation/net/http/instrumentation_test.rb
+++ b/instrumentation/net_http/test/opentelemetry/instrumentation/net/http/instrumentation_test.rb
@@ -210,6 +210,8 @@
 
   describe '#connect' do
     it 'emits span on connect' do
+      port = nil
+
       WebMock.allow_net_connect!
       TCPServer.open('localhost', 0) do |server|
         Thread.start { server.accept }
@@ -225,6 +227,7 @@
       _(span.name).must_equal 'connect'
       _(span.attributes['net.peer.name']).must_equal('localhost')
       _(span.attributes['net.peer.port']).wont_be_nil
+      _(span.attributes['net.peer.port']).must_equal(port)
     ensure
       WebMock.disable_net_connect!
     end