diff --git a/contrib/drivers/mssql/mssql_do_insert.go b/contrib/drivers/mssql/mssql_do_insert.go
index 4a6361754..cec0b580b 100644
--- a/contrib/drivers/mssql/mssql_do_insert.go
+++ b/contrib/drivers/mssql/mssql_do_insert.go
@@ -42,8 +42,13 @@ func (d *Driver) DoInsert(
 			}
 			foundPrimaryKey := false
 			for _, primaryKey := range primaryKeys {
-				if _, ok := list[0][primaryKey]; ok {
-					foundPrimaryKey = true
+				for dataKey := range list[0] {
+					if strings.EqualFold(dataKey, primaryKey) {
+						foundPrimaryKey = true
+						break
+					}
+				}
+				if foundPrimaryKey {
 					break
 				}
 			}