diff --git a/tool/goinstall/installer.go b/tool/goinstall/installer.go
index 7863323..5f9daf2 100644
--- a/tool/goinstall/installer.go
+++ b/tool/goinstall/installer.go
@@ -6,6 +6,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"text/template"
 
@@ -43,6 +44,10 @@ func (i Installer) InstallTo(version, destDir string) (string, error) {
 	fields := strings.Split(path, "/")
 	binName := fields[len(fields)-1]
 	binPath := filepath.Join(destDir, binName)
+	// TODO: probably refactor this somewhere
+	if runtime.GOOS == "windows" {
+		binPath = binPath + ".exe"
+	}
 
 	spec := fmt.Sprintf("%s@%s", path, version)
 	if strings.HasPrefix(i.config.Module, ".") || strings.HasPrefix(i.config.Module, "/") {