diff --git a/command/agent/http_test.go b/command/agent/http_test.go
index 4fd6b39b3..dddc8f82c 100644
--- a/command/agent/http_test.go
+++ b/command/agent/http_test.go
@@ -13,6 +13,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"net/url"
+	"os"
 	"strings"
 	"testing"
 	"time"
@@ -997,7 +998,8 @@ func TestHTTPServer_Limits_OK(t *testing.T) {
 		// timed out.
 		require.True(t, time.Now().After(readDeadline))
 
-		testutil.RequireDeadlineErr(t, err)
+		require.Truef(t, errors.Is(err, os.ErrDeadlineExceeded),
+			"error does not wrap os.ErrDeadlineExceeded: (%T) %v", err, err)
 	}
 
 	assertNoLimit := func(t *testing.T, addr string) {
@@ -1030,7 +1032,8 @@ func TestHTTPServer_Limits_OK(t *testing.T) {
 			case <-time.After(2 * time.Second):
 				t.Fatalf("timed out waiting for conn error %d", i)
 			case err := <-errCh:
-				testutil.RequireDeadlineErr(t, err)
+				require.Truef(t, errors.Is(err, os.ErrDeadlineExceeded),
+					"error does not wrap os.ErrDeadlineExceeded: (%T) %v", err, err)
 			}
 		}
 	}
diff --git a/nomad/rpc_test.go b/nomad/rpc_test.go
index bee07a9f5..f92087892 100644
--- a/nomad/rpc_test.go
+++ b/nomad/rpc_test.go
@@ -3,6 +3,7 @@ package nomad
 import (
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"io"
 	"net"
@@ -696,7 +697,9 @@ func TestRPC_Limits_OK(t *testing.T) {
 			require.Truef(t, now.After(readDeadline),
 				"Client read deadline (%s) should be in the past (before %s)", readDeadline, now)
 
-			testutil.RequireDeadlineErr(t, err)
+			require.Truef(t, errors.Is(err, os.ErrDeadlineExceeded),
+				"error does not wrap os.ErrDeadlineExceeded: (%T) %v", err, err)
+
 			return
 		}
 
@@ -739,7 +742,8 @@ func TestRPC_Limits_OK(t *testing.T) {
 		conn.SetReadDeadline(readDeadline)
 		n, err = conn.Read(buf)
 		require.Zero(t, n)
-		testutil.RequireDeadlineErr(t, err)
+		require.Truef(t, errors.Is(err, os.ErrDeadlineExceeded),
+			"error does not wrap os.ErrDeadlineExceeded: (%T) %v", err, err)
 	}
 
 	assertNoLimit := func(t *testing.T, addr string) {
@@ -773,7 +777,8 @@ func TestRPC_Limits_OK(t *testing.T) {
 			case <-deadline:
 				t.Fatalf("timed out waiting for conn error %d/%d", i+1, maxConns)
 			case err := <-errCh:
-				testutil.RequireDeadlineErr(t, err)
+				require.Truef(t, errors.Is(err, os.ErrDeadlineExceeded),
+					"error does not wrap os.ErrDeadlineExceeded: (%T) %v", err, err)
 			}
 		}
 	}
@@ -983,7 +988,8 @@ func TestRPC_Limits_Streaming(t *testing.T) {
 
 	conn.SetReadDeadline(time.Now().Add(1 * time.Second))
 	_, err = conn.Read(buf)
-	testutil.RequireDeadlineErr(t, err)
+	require.Truef(t, errors.Is(err, os.ErrDeadlineExceeded),
+		"error does not wrap os.ErrDeadlineExceeded: (%T) %v", err, err)
 
 	// Close 1 streamer and assert another is allowed
 	t.Logf("expect streaming connection 0 to exit with error")
@@ -1002,7 +1008,7 @@ func TestRPC_Limits_Streaming(t *testing.T) {
 			return false, fmt.Errorf("connection was rejected")
 		}
 
-		testutil.RequireDeadlineErr(t, err)
+		require.True(t, errors.Is(err, os.ErrDeadlineExceeded))
 		return true, nil
 	}, func(err error) {
 		require.NoError(t, err)
diff --git a/testutil/net.go b/testutil/net.go
deleted file mode 100644
index bd8813305..000000000
--- a/testutil/net.go
+++ /dev/null
@@ -1,22 +0,0 @@
-package testutil
-
-import (
-	"net"
-
-	testing "github.com/mitchellh/go-testing-interface"
-	"github.com/stretchr/testify/require"
-)
-
-// RequireDeadlineErr requires that an error be caused by a net.Conn's deadline
-// being reached (after being set by conn.Set{Read,Write}Deadline or
-// SetDeadline).
-func RequireDeadlineErr(t testing.T, err error) {
-	t.Helper()
-
-	require.NotNil(t, err)
-	netErr, ok := err.(net.Error)
-	require.Truef(t, ok, "error does not implement net.Error: (%T) %v", err, err)
-	require.Contains(t, netErr.Error(), ": i/o timeout")
-	require.True(t, netErr.Timeout())
-	require.True(t, netErr.Temporary())
-}