diff --git a/osquery/tables/specs/darwin/cacerts.table b/osquery/tables/specs/darwin/cacerts.table
index bd21b557..354ef884 100644
--- a/osquery/tables/specs/darwin/cacerts.table
+++ b/osquery/tables/specs/darwin/cacerts.table
@@ -1,8 +1,8 @@
 table_name("cacerts")
 schema([
     Column(name="common_name", type="std::string"),
-    Column(name="not_valid_before", type="int"),
-    Column(name="not_valid_after", type="int"),
+    Column(name="not_valid_before", type="std::string"),
+    Column(name="not_valid_after", type="std::string"),
     Column(name="key_algorithm", type="std::string"),
     Column(name="key_usage", type="std::string"),
     Column(name="subject_key_id", type="std::string"),