diff --git a/src/Miningcore/Api/Controllers/PoolApiController.cs b/src/Miningcore/Api/Controllers/PoolApiController.cs
index 7230b3e62..d84de8f7e 100644
--- a/src/Miningcore/Api/Controllers/PoolApiController.cs
+++ b/src/Miningcore/Api/Controllers/PoolApiController.cs
@@ -73,7 +73,7 @@ public async Task<GetPoolsResponse> Get(CancellationToken ct, [FromQuery] uint t
 
                 if(lastBlockTime.HasValue)
                 {
-                    DateTime startTime = lastBlockTime.Value;
+                    var startTime = lastBlockTime.Value;
                     var poolEffort = await cf.Run(con => shareRepo.GetEffortBetweenCreatedAsync(con, config.Id, pool.ShareMultiplier, startTime, clock.Now));
                     if(poolEffort.HasValue)
                         result.PoolEffort = poolEffort.Value;
@@ -142,7 +142,7 @@ public async Task<GetPoolResponse> GetPoolInfoAsync(string poolId, CancellationT
 
         if(lastBlockTime.HasValue)
         {
-            DateTime startTime = lastBlockTime.Value;
+            var startTime = lastBlockTime.Value;
             var poolEffort = await cf.Run(con => shareRepo.GetEffortBetweenCreatedAsync(con, pool.Id, poolInstance.ShareMultiplier, startTime, clock.Now));
             if(poolEffort.HasValue)
                 response.Pool.PoolEffort = poolEffort.Value;