diff --git a/test/src/spec/dao.rs b/test/src/spec/dao.rs
index df6a7f1d..a2717da5 100644
--- a/test/src/spec/dao.rs
+++ b/test/src/spec/dao.rs
@@ -48,6 +48,7 @@ impl Spec for DaoPrepareOne {
 
     fn modify_spec_toml(&self, spec_toml: &mut ChainSpec) {
         spec_toml.params.genesis_epoch_length = Some(EPOCH_LENGTH);
+        spec_toml.params.epoch_duration_target = Some(EPOCH_LENGTH * 8);
         spec_toml.params.permanent_difficulty_in_dummy = Some(true);
     }
 
@@ -99,6 +100,7 @@ impl Spec for DaoPrepareMultiple {
 
     fn modify_spec_toml(&self, spec_toml: &mut ChainSpec) {
         spec_toml.params.genesis_epoch_length = Some(EPOCH_LENGTH);
+        spec_toml.params.epoch_duration_target = Some(EPOCH_LENGTH * 8);
         spec_toml.params.permanent_difficulty_in_dummy = Some(true);
     }
 
@@ -146,6 +148,7 @@ impl Spec for DaoWithdrawMultiple {
 
     fn modify_spec_toml(&self, spec_toml: &mut ChainSpec) {
         spec_toml.params.genesis_epoch_length = Some(EPOCH_LENGTH);
+        spec_toml.params.epoch_duration_target = Some(EPOCH_LENGTH * 8);
         spec_toml.params.permanent_difficulty_in_dummy = Some(true);
     }