diff --git a/exec.go b/exec.go
index 6973404..65b27de 100644
--- a/exec.go
+++ b/exec.go
@@ -11,7 +11,7 @@ import (
 )
 
 const (
-	defaultWaitDelay = 15 * time.Second
+	defaultWaitDelay = 30 * time.Second
 )
 
 // Nix is the name of the nix program.