diff --git a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/ExpressionParser.scala b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/ExpressionParser.scala
index d5d64b48d69d7..b45ce801018ea 100644
--- a/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/ExpressionParser.scala
+++ b/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/ExpressionParser.scala
@@ -303,7 +303,7 @@ object ExpressionParser extends JavaTokenParsers with PackratParsers {
 
     case expr ~ _ ~ (MONTHS.key | MONTH.key) => toMonthInterval(expr, 1)
 
-    case expr ~ _ ~ (WEEKS.key | WEEKS.key) => toMilliInterval(expr, 7 * MILLIS_PER_DAY)
+    case expr ~ _ ~ (WEEKS.key | WEEK.key) => toMilliInterval(expr, 7 * MILLIS_PER_DAY)
 
     case expr ~ _ ~ (DAYS.key | DAY.key) => toMilliInterval(expr, MILLIS_PER_DAY)
 
diff --git a/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala b/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala
index 31c9b6c3d0167..23bd2ae337998 100644
--- a/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala
+++ b/flink-libraries/flink-table/src/test/scala/org/apache/flink/table/expressions/ScalarFunctionsTest.scala
@@ -2764,6 +2764,11 @@ class ScalarFunctionsTest extends ScalarTypesTestBase {
       "'2016-03-31'.toDate - 1.month",
       "timestampadd(MONTH, -1, date '2016-03-31')",
       "2016-02-29")
+
+    testAllApis("2016-03-31".toDate - 1.week,
+      "'2016-03-31'.toDate - 1.week",
+      "timestampadd(WEEK, -1, date '2016-03-31')",
+      "2016-03-24")
   }
 
   // ----------------------------------------------------------------------------------------------