diff --git a/shared/params/config.go b/shared/params/config.go
index 9f98a234740c..e4c32255c280 100644
--- a/shared/params/config.go
+++ b/shared/params/config.go
@@ -257,7 +257,7 @@ func MinimalSpecConfig() *BeaconChainConfig {
 	minimalConfig.BLSWithdrawalPrefixByte = byte(0)
 
 	// Time parameters
-	minimalConfig.SecondsPerSlot = 12
+	minimalConfig.SecondsPerSlot = 6
 	minimalConfig.MinAttestationInclusionDelay = 1
 	minimalConfig.SlotsPerEpoch = 8
 	minimalConfig.MinSeedLookahead = 1