diff --git a/pkg/eval/port.go b/pkg/eval/port.go
index 3ba7f9ab..a633395c 100644
--- a/pkg/eval/port.go
+++ b/pkg/eval/port.go
@@ -6,7 +6,6 @@ import (
 	"io"
 	"os"
 	"sync"
-	"syscall"
 
 	"src.elv.sh/pkg/eval/errs"
 	"src.elv.sh/pkg/eval/vals"
@@ -292,7 +291,7 @@ func (bo byteOutput) WriteString(s string) (int, error) {
 
 func convertReaderGone(err error) error {
 	if pathErr, ok := err.(*os.PathError); ok {
-		if pathErr.Err == syscall.EPIPE {
+		if pathErr.Err == epipe {
 			return errs.ReaderGone{}
 		}
 	}
diff --git a/pkg/eval/port_unix.go b/pkg/eval/port_unix.go
new file mode 100644
index 00000000..76dfcdea
--- /dev/null
+++ b/pkg/eval/port_unix.go
@@ -0,0 +1,7 @@
+//+build !windows,!plan9,!js
+
+package eval
+
+import "syscall"
+
+var epipe = syscall.EPIPE
diff --git a/pkg/eval/port_windows.go b/pkg/eval/port_windows.go
new file mode 100644
index 00000000..a2759d55
--- /dev/null
+++ b/pkg/eval/port_windows.go
@@ -0,0 +1,10 @@
+package eval
+
+import "syscall"
+
+// Error number 232 is what Windows returns when trying to write on a pipe who
+// reader has gone. The syscall package defines an EPIPE on Windows, but that's
+// not what Windows API actually returns.
+//
+// https://docs.microsoft.com/en-us/windows/win32/debug/system-error-codes--0-499-
+var epipe = syscall.Errno(232)