diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index c5710c11e4..242f7f024d 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -602,7 +602,7 @@ func (diff *BlockOverrides) Apply(blockCtx *vm.BlockContext) {
 		blockCtx.Difficulty = diff.Difficulty.ToInt()
 	}
 	if diff.Time != nil {
-		blockCtx.Time = diff.Time.ToInt()
+		blockCtx.Time = diff.Time.ToInt().Uint64()
 	}
 	if diff.GasLimit != nil {
 		blockCtx.GasLimit = uint64(*diff.GasLimit)