diff --git a/database/core.tsql b/database/core.tsql
index 141925262e70dc7d1f668a8a58ba60cbc5246cff..f0d4610b292acaaf928848fea893ac9fe8727853 100644
--- a/database/core.tsql
+++ b/database/core.tsql
@@ -104,7 +104,7 @@ CREATE TABLE @PREFIX@accounting (
 
 	AcctAuthentic		INT UNSIGNED NOT NULL,
 
-	EventTimestamp		INT UNSIGNED NOT NULL,
+	EventTimestamp		DATETIME NOT NULL,
 
 	NASIdentifier		VARCHAR(255) NOT NULL,