diff --git a/flang/lib/Parser/openacc-parsers.cpp b/flang/lib/Parser/openacc-parsers.cpp
--- a/flang/lib/Parser/openacc-parsers.cpp
+++ b/flang/lib/Parser/openacc-parsers.cpp
@@ -111,7 +111,7 @@
         construct<AccClause>(construct<AccClause::Vector>(maybe(
             parenthesized(("LENGTH:" >> scalarIntExpr || scalarIntExpr))))) ||
     "WAIT" >> construct<AccClause>(construct<AccClause::Wait>(
-                  maybe(Parser<AccWaitArgument>{}))) ||
+                  maybe(parenthesized(Parser<AccWaitArgument>{})))) ||
     "WORKER" >>
         construct<AccClause>(construct<AccClause::Worker>(maybe(
             parenthesized(("NUM:" >> scalarIntExpr || scalarIntExpr))))) ||
@@ -125,8 +125,10 @@
 TYPE_PARSER(construct<AccObjectListWithModifier>(
     maybe(Parser<AccDataModifier>{}), Parser<AccObjectList>{}))
 
-TYPE_PARSER(construct<AccWaitArgument>(
-    maybe("DEVNUM:" >> scalarIntExpr / ":"), nonemptyList(scalarIntExpr)))
+// 2.16.3 (2485) wait-argument is:
+//   [devnum : int-expr :] [queues :] int-expr-list
+TYPE_PARSER(construct<AccWaitArgument>(maybe("DEVNUM:" >> scalarIntExpr / ":"),
+    "QUEUES:" >> nonemptyList(scalarIntExpr) || nonemptyList(scalarIntExpr)))
 
 // 2.9 (1609) size-expr is one of:
 //   int-expr
diff --git a/flang/lib/Parser/unparse.cpp b/flang/lib/Parser/unparse.cpp
--- a/flang/lib/Parser/unparse.cpp
+++ b/flang/lib/Parser/unparse.cpp
@@ -1937,6 +1937,10 @@
     Put("\n");
     EndOpenACC();
   }
+  void Unparse(const AccWaitArgument &x) {
+    Walk("DEVNUM:", std::get<std::optional<ScalarIntExpr>>(x.t), ":");
+    Walk(std::get<std::list<ScalarIntExpr>>(x.t), ",");
+  }
   void Unparse(const OpenACCWaitConstruct &x) {
     BeginOpenACC();
     Word("!$ACC ");
diff --git a/flang/test/Semantics/acc-clause-validity.f90 b/flang/test/Semantics/acc-clause-validity.f90
--- a/flang/test/Semantics/acc-clause-validity.f90
+++ b/flang/test/Semantics/acc-clause-validity.f90
@@ -187,6 +187,30 @@
   !ERROR: Unmatched END PARALLEL LOOP directive
   !$acc end parallel loop
 
+  !$acc kernels wait(1, 2) async(3)
+  !$acc end kernels
+
+  !$acc kernels wait(queues: 1, 2) async(3)
+  !$acc end kernels
+
+  !$acc kernels wait(devnum: 1: 1, 2) async(3)
+  !$acc end kernels
+
+  !$acc kernels wait(devnum: 1: queues: 1, 2) async(3)
+  !$acc end kernels
+
+  !$acc wait(1)
+  !$acc wait(1, 2)
+
+  !$acc wait(queues: 1)
+  !$acc wait(queues: 1, 2)
+
+  !$acc wait(devnum: 1: 3)
+  !$acc wait(devnum: 1: 3, 4)
+
+  !$acc wait(devnum: 1: queues: 3)
+  !$acc wait(devnum: 1: queues: 3, 4)
+
  contains
 
    subroutine sub1(a)