diff --git a/builder/docker/config.go b/builder/docker/config.go
index 684e88bd9..8b41589e0 100644
--- a/builder/docker/config.go
+++ b/builder/docker/config.go
@@ -75,6 +75,9 @@ func NewConfig(raws ...interface{}) (*Config, []string, error) {
 	// Defaults
 	if len(c.RunCommand) == 0 {
 		c.RunCommand = []string{"-d", "-i", "-t", "--entrypoint=/bin/sh", "--", "{{.Image}}"}
+		if c.WindowsContainer {
+			c.RunCommand = []string{"-d", "-i", "-t", "--entrypoint=powershell", "--", "{{.Image}}"}
+		}
 	}
 
 	// Default Pull if it wasn't set