diff --git a/src/api2/config/datastore.rs b/src/api2/config/datastore.rs
index 7ab36047..7bb13c4b 100644
--- a/src/api2/config/datastore.rs
+++ b/src/api2/config/datastore.rs
@@ -243,12 +243,12 @@ pub fn update_datastore(
     comment: Option<String>,
     gc_schedule: Option<String>,
     prune_schedule: Option<String>,
-    keep_last: Option<i64>,
-    keep_hourly: Option<i64>,
-    keep_daily: Option<i64>,
-    keep_weekly: Option<i64>,
-    keep_monthly: Option<i64>,
-    keep_yearly: Option<i64>,
+    keep_last: Option<u64>,
+    keep_hourly: Option<u64>,
+    keep_daily: Option<u64>,
+    keep_weekly: Option<u64>,
+    keep_monthly: Option<u64>,
+    keep_yearly: Option<u64>,
     delete: Option<Vec<DeletableProperty>>,
     digest: Option<String>,
 ) -> Result<(), Error> {
diff --git a/src/config/datastore.rs b/src/config/datastore.rs
index 5c46e07f..5fe55c72 100644
--- a/src/config/datastore.rs
+++ b/src/config/datastore.rs
@@ -83,17 +83,17 @@ pub struct DataStoreConfig {
     #[serde(skip_serializing_if="Option::is_none")]
     pub prune_schedule: Option<String>,
     #[serde(skip_serializing_if="Option::is_none")]
-    pub keep_last: Option<i64>,
+    pub keep_last: Option<u64>,
     #[serde(skip_serializing_if="Option::is_none")]
-    pub keep_hourly: Option<i64>,
+    pub keep_hourly: Option<u64>,
     #[serde(skip_serializing_if="Option::is_none")]
-    pub keep_daily: Option<i64>,
+    pub keep_daily: Option<u64>,
     #[serde(skip_serializing_if="Option::is_none")]
-    pub keep_weekly: Option<i64>,
+    pub keep_weekly: Option<u64>,
     #[serde(skip_serializing_if="Option::is_none")]
-    pub keep_monthly: Option<i64>,
+    pub keep_monthly: Option<u64>,
     #[serde(skip_serializing_if="Option::is_none")]
-    pub keep_yearly: Option<i64>,
+    pub keep_yearly: Option<u64>,
 }
 
 fn init() -> SectionConfig {