diff --git a/pkg/dockerfile/buildargs.go b/pkg/dockerfile/buildargs.go
index bc393f31f..b929528ef 100644
--- a/pkg/dockerfile/buildargs.go
+++ b/pkg/dockerfile/buildargs.go
@@ -29,7 +29,7 @@ type BuildArgs struct {
 func NewBuildArgs(args []string) *BuildArgs {
 	argsFromOptions := make(map[string]*string)
 	for _, a := range args {
-		s := strings.Split(a, "=")
+		s := strings.SplitN(a, "=", 2)
 		if len(s) == 1 {
 			argsFromOptions[s[0]] = nil
 		} else {