diff --git a/src/internal/poll/errno_unix.go b/src/internal/poll/errno_unix.go
new file mode 100644
index 0000000000..0b23fc3210
--- /dev/null
+++ b/src/internal/poll/errno_unix.go
@@ -0,0 +1,33 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+
+package poll
+
+import "syscall"
+
+// Do the interface allocations only once for common
+// Errno values.
+var (
+	errEAGAIN error = syscall.EAGAIN
+	errEINVAL error = syscall.EINVAL
+	errENOENT error = syscall.ENOENT
+)
+
+// errnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e syscall.Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case syscall.EAGAIN:
+		return errEAGAIN
+	case syscall.EINVAL:
+		return errEINVAL
+	case syscall.ENOENT:
+		return errENOENT
+	}
+	return e
+}
diff --git a/src/internal/poll/errno_windows.go b/src/internal/poll/errno_windows.go
new file mode 100644
index 0000000000..e3bddb4bb2
--- /dev/null
+++ b/src/internal/poll/errno_windows.go
@@ -0,0 +1,31 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build windows
+
+package poll
+
+import "syscall"
+
+// Do the interface allocations only once for common
+// Errno values.
+
+var (
+	errERROR_IO_PENDING error = syscall.Errno(syscall.ERROR_IO_PENDING)
+)
+
+// ErrnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e syscall.Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case syscall.ERROR_IO_PENDING:
+		return errERROR_IO_PENDING
+	}
+	// TODO: add more here, after collecting data on the common
+	// error values see on Windows. (perhaps when running
+	// all.bat?)
+	return e
+}
diff --git a/src/internal/poll/fd_poll_runtime.go b/src/internal/poll/fd_poll_runtime.go
index 687f702556..2932615d85 100644
--- a/src/internal/poll/fd_poll_runtime.go
+++ b/src/internal/poll/fd_poll_runtime.go
@@ -42,7 +42,7 @@ func (pd *pollDesc) init(fd *FD) error {
 			runtime_pollUnblock(ctx)
 			runtime_pollClose(ctx)
 		}
-		return syscall.Errno(errno)
+		return errnoErr(syscall.Errno(errno))
 	}
 	pd.runtimeCtx = ctx
 	return nil