diff --git a/interp/load.go b/interp/load.go
index 8761f7a..6bef4eb 100644
--- a/interp/load.go
+++ b/interp/load.go
@@ -50,7 +50,8 @@ func init() {
 
 func LoadScript(cmdStream []parser.Cmd, opts *Options) (*Script, error) {
 	s := &Script{
-		opts: opts,
+		extensions: map[string]struct{}{},
+		opts:       opts,
 	}
 
 	loadedCmds, err := LoadBlock(s, cmdStream)