diff --git a/env.c b/env.c
index 9a0f8b5..83d423c 100644
--- a/env.c
+++ b/env.c
@@ -15,8 +15,8 @@ void env_init(struct envelope_t *env, double attack, double attack_hold, double
 	env->release     = release;
 
 	env->attack_s      = env->attack * _sample_rate;
-	env->attack_hold_s = env->attack_hold * _sample_rate;
-	env->decay_s       = env->decay * _sample_rate;
+	env->attack_hold_s = env->attack_s + env->attack_hold * _sample_rate;
+	env->decay_s       = env->attack_hold_s + env->decay * _sample_rate;
 	env->release_s     = env->release * _sample_rate;
 }