diff --git a/config/config.go b/config/config.go
index 8f6b79e..dfde93c 100644
--- a/config/config.go
+++ b/config/config.go
@@ -6,6 +6,7 @@ import (
 	"io"
 	"net"
 	"os"
+	"strings"
 	"time"
 
 	yaml "gopkg.in/yaml.v2"
@@ -157,11 +158,13 @@ type NetworkDef struct {
 	Script   string
 }
 
+var b64 = base64.RawStdEncoding
+
 func (c *Config) FileContent(filePath string) []byte {
 	for _, f := range c.Files {
 		if f.Path == filePath {
 			if f.Content64 != "" {
-				decoded, err := base64.StdEncoding.DecodeString(f.Content64)
+				decoded, err := b64.DecodeString(strings.TrimRight(f.Content64, "="))
 				if err != nil {
 					panic(fmt.Errorf("invalid base64 content in file %s", f.Path))
 				}