diff --git a/flang/include/flang/Parser/dump-parse-tree.h b/flang/include/flang/Parser/dump-parse-tree.h
index de2716410d6cd..aceff0a541a83 100644
--- a/flang/include/flang/Parser/dump-parse-tree.h
+++ b/flang/include/flang/Parser/dump-parse-tree.h
@@ -586,6 +586,8 @@ class ParseTreeDumper {
   NODE(parser, OmpExpectation)
   NODE_ENUM(OmpExpectation, Value)
   NODE(parser, OmpFailClause)
+  NODE(parser, OmpFallbackModifier)
+  NODE_ENUM(OmpFallbackModifier, Value)
   NODE(parser, OmpFromClause)
   NODE(OmpFromClause, Modifier)
   NODE(parser, OmpGrainsizeClause)
diff --git a/flang/include/flang/Parser/parse-tree.h b/flang/include/flang/Parser/parse-tree.h
index 8c7578f7a1941..94341e489a322 100644
--- a/flang/include/flang/Parser/parse-tree.h
+++ b/flang/include/flang/Parser/parse-tree.h
@@ -3992,6 +3992,17 @@ struct OmpExpectation {
   WRAPPER_CLASS_BOILERPLATE(OmpExpectation, Value);
 };
 
+// Ref: [6.1:tbd]
+//
+// fallback-modifier ->
+//    FALLBACK(fallback-mode)                       // since 6.1
+// fallback-mode ->
+//    ABORT | DEFAULT_MEM | NULL                    // since 6.1
+struct OmpFallbackModifier {
+  ENUM_CLASS(Value, Abort, Default_Mem, Null);
+  WRAPPER_CLASS_BOILERPLATE(OmpFallbackModifier, Value);
+};
+
 // REF: [5.1:217-220], [5.2:293-294]
 //
 // OmpInteropRuntimeIdentifier ->                   // since 5.2
@@ -4121,9 +4132,8 @@ struct OmpOrderModifier {
 //
 // prescriptiveness ->
 //    STRICT                                        // since 5.1
-//    FALLBACK                                      // since 6.1
 struct OmpPrescriptiveness {
-  ENUM_CLASS(Value, Strict, Fallback)
+  ENUM_CLASS(Value, Strict)
   WRAPPER_CLASS_BOILERPLATE(OmpPrescriptiveness, Value);
 };
 
@@ -4504,7 +4514,7 @@ struct OmpDynamicAllocatorsClause {
 
 struct OmpDynGroupprivateClause {
   TUPLE_CLASS_BOILERPLATE(OmpDynGroupprivateClause);
-  MODIFIER_BOILERPLATE(OmpAccessGroup, OmpPrescriptiveness);
+  MODIFIER_BOILERPLATE(OmpAccessGroup, OmpFallbackModifier);
   std::tuple<MODIFIERS(), ScalarIntExpr> t;
 };
 
diff --git a/flang/lib/Lower/OpenMP/Clauses.cpp b/flang/lib/Lower/OpenMP/Clauses.cpp
index 0f60b47991004..a953e94be0b0f 100644
--- a/flang/lib/Lower/OpenMP/Clauses.cpp
+++ b/flang/lib/Lower/OpenMP/Clauses.cpp
@@ -394,8 +394,6 @@ makePrescriptiveness(parser::OmpPrescriptiveness::Value v) {
   switch (v) {
   case parser::OmpPrescriptiveness::Value::Strict:
     return clause::Prescriptiveness::Strict;
-  case parser::OmpPrescriptiveness::Value::Fallback:
-    return clause::Prescriptiveness::Fallback;
   }
   llvm_unreachable("Unexpected prescriptiveness");
 }
@@ -797,21 +795,31 @@ DynGroupprivate make(const parser::OmpClause::DynGroupprivate &inp,
                      semantics::SemanticsContext &semaCtx) {
   // imp.v -> OmpDyngroupprivateClause
   CLAUSET_ENUM_CONVERT( //
-      convert, parser::OmpAccessGroup::Value, DynGroupprivate::AccessGroup,
+      makeAccessGroup, parser::OmpAccessGroup::Value,
+      DynGroupprivate::AccessGroup,
       // clang-format off
       MS(Cgroup,  Cgroup)
       // clang-format on
   );
 
+  CLAUSET_ENUM_CONVERT( //
+      makeFallback, parser::OmpFallbackModifier::Value,
+      DynGroupprivate::Fallback,
+      // clang-format off
+      MS(Abort,       Abort)
+      MS(Default_Mem, Default_Mem)
+      MS(Null,        Null)
+      // clang-format on
+  );
+
   auto &mods = semantics::OmpGetModifiers(inp.v);
   auto *m0 = semantics::OmpGetUniqueModifier<parser::OmpAccessGroup>(mods);
-  auto *m1 = semantics::OmpGetUniqueModifier<parser::OmpPrescriptiveness>(mods);
+  auto *m1 = semantics::OmpGetUniqueModifier<parser::OmpFallbackModifier>(mods);
   auto &size = std::get<parser::ScalarIntExpr>(inp.v.t);
 
-  return DynGroupprivate{
-      {/*AccessGroup=*/maybeApplyToV(convert, m0),
-       /*Prescriptiveness=*/maybeApplyToV(makePrescriptiveness, m1),
-       /*Size=*/makeExpr(size, semaCtx)}};
+  return DynGroupprivate{{/*AccessGroup=*/maybeApplyToV(makeAccessGroup, m0),
+                          /*Fallback=*/maybeApplyToV(makeFallback, m1),
+                          /*Size=*/makeExpr(size, semaCtx)}};
 }
 
 Enter make(const parser::OmpClause::Enter &inp,
diff --git a/flang/lib/Parser/openmp-parsers.cpp b/flang/lib/Parser/openmp-parsers.cpp
index 4374acbbe51bf..e2da60ed19de8 100644
--- a/flang/lib/Parser/openmp-parsers.cpp
+++ b/flang/lib/Parser/openmp-parsers.cpp
@@ -791,6 +791,12 @@ TYPE_PARSER(construct<OmpDirectiveNameModifier>(OmpDirectiveNameParser{}))
 TYPE_PARSER(construct<OmpExpectation>( //
     "PRESENT" >> pure(OmpExpectation::Value::Present)))
 
+TYPE_PARSER(construct<OmpFallbackModifier>("FALLBACK"_tok >>
+    parenthesized( //
+        "ABORT" >> pure(OmpFallbackModifier::Value::Abort) ||
+        "DEFAULT_MEM" >> pure(OmpFallbackModifier::Value::Default_Mem) ||
+        "NULL" >> pure(OmpFallbackModifier::Value::Null))))
+
 TYPE_PARSER(construct<OmpInteropRuntimeIdentifier>(
     construct<OmpInteropRuntimeIdentifier>(charLiteralConstant) ||
     construct<OmpInteropRuntimeIdentifier>(scalarIntConstantExpr)))
@@ -857,8 +863,7 @@ TYPE_PARSER(construct<OmpOrderingModifier>(
     "SIMD" >> pure(OmpOrderingModifier::Value::Simd)))
 
 TYPE_PARSER(construct<OmpPrescriptiveness>(
-    "STRICT" >> pure(OmpPrescriptiveness::Value::Strict) ||
-    "FALLBACK" >> pure(OmpPrescriptiveness::Value::Fallback)))
+    "STRICT" >> pure(OmpPrescriptiveness::Value::Strict)))
 
 TYPE_PARSER(construct<OmpPresentModifier>( //
     "PRESENT" >> pure(OmpPresentModifier::Value::Present)))
@@ -925,7 +930,7 @@ TYPE_PARSER( //
     sourced(construct<OmpDynGroupprivateClause::Modifier>(
         Parser<OmpAccessGroup>{})) ||
     sourced(construct<OmpDynGroupprivateClause::Modifier>(
-        Parser<OmpPrescriptiveness>{})))
+        Parser<OmpFallbackModifier>{})))
 
 TYPE_PARSER(
     sourced(construct<OmpDeviceClause::Modifier>(Parser<OmpDeviceModifier>{})))
diff --git a/flang/lib/Parser/unparse.cpp b/flang/lib/Parser/unparse.cpp
index 84123030195e9..c4967b6c7a82e 100644
--- a/flang/lib/Parser/unparse.cpp
+++ b/flang/lib/Parser/unparse.cpp
@@ -2281,6 +2281,11 @@ class UnparseVisitor {
     Walk(std::get<OmpObjectList>(x.t));
     Walk(": ", std::get<std::optional<std::list<Modifier>>>(x.t));
   }
+  void Unparse(const OmpFallbackModifier &x) {
+    Word("FALLBACK(");
+    Walk(x.v);
+    Put(")");
+  }
   void Unparse(const OmpDynGroupprivateClause &x) {
     using Modifier = OmpDynGroupprivateClause::Modifier;
     Walk(std::get<std::optional<std::list<Modifier>>>(x.t), ": ");
@@ -2790,6 +2795,7 @@ class UnparseVisitor {
       OmpDeviceTypeClause, DeviceTypeDescription) // OMP device_type
   WALK_NESTED_ENUM(OmpReductionModifier, Value) // OMP reduction-modifier
   WALK_NESTED_ENUM(OmpExpectation, Value) // OMP motion-expectation
+  WALK_NESTED_ENUM(OmpFallbackModifier, Value) // OMP fallback-modifier
   WALK_NESTED_ENUM(OmpInteropType, Value) // OMP InteropType
   WALK_NESTED_ENUM(OmpOrderClause, Ordering) // OMP ordering
   WALK_NESTED_ENUM(OmpOrderModifier, Value) // OMP order-modifier
diff --git a/flang/test/Parser/OpenMP/dyn-groupprivate-clause.f90 b/flang/test/Parser/OpenMP/dyn-groupprivate-clause.f90
index 7d41efd348e50..599821dbe3377 100644
--- a/flang/test/Parser/OpenMP/dyn-groupprivate-clause.f90
+++ b/flang/test/Parser/OpenMP/dyn-groupprivate-clause.f90
@@ -26,21 +26,21 @@ subroutine f00(n)
 subroutine f01(n)
   implicit none
   integer :: n
-  !$omp target dyn_groupprivate(strict: n)
+  !$omp target dyn_groupprivate(fallback(abort): n)
   !$omp end target
 end
 
 !UNPARSE: SUBROUTINE f01 (n)
 !UNPARSE:  IMPLICIT NONE
 !UNPARSE:  INTEGER n
-!UNPARSE: !$OMP TARGET DYN_GROUPPRIVATE(STRICT: n)
+!UNPARSE: !$OMP TARGET DYN_GROUPPRIVATE(FALLBACK(ABORT): n)
 !UNPARSE: !$OMP END TARGET
 !UNPARSE: END SUBROUTINE
 
 !PARSE-TREE: OmpBeginDirective
 !PARSE-TREE: | OmpDirectiveName -> llvm::omp::Directive = target
 !PARSE-TREE: | OmpClauseList -> OmpClause -> DynGroupprivate -> OmpDynGroupprivateClause
-!PARSE-TREE: | | Modifier -> OmpPrescriptiveness -> Value = Strict
+!PARSE-TREE: | | Modifier -> OmpFallbackModifier -> Value = Abort
 !PARSE-TREE: | | Scalar -> Integer -> Expr = 'n'
 !PARSE-TREE: | | | Designator -> DataRef -> Name = 'n'
 !PARSE-TREE: | Flags = None
@@ -49,21 +49,21 @@ subroutine f01(n)
 subroutine f02(n)
   implicit none
   integer :: n
-  !$omp target dyn_groupprivate(fallback, cgroup: n)
+  !$omp target dyn_groupprivate(fallback(default_mem), cgroup: n)
   !$omp end target
 end
 
 !UNPARSE: SUBROUTINE f02 (n)
 !UNPARSE:  IMPLICIT NONE
 !UNPARSE:  INTEGER n
-!UNPARSE: !$OMP TARGET DYN_GROUPPRIVATE(FALLBACK, CGROUP: n)
+!UNPARSE: !$OMP TARGET DYN_GROUPPRIVATE(FALLBACK(DEFAULT_MEM), CGROUP: n)
 !UNPARSE: !$OMP END TARGET
 !UNPARSE: END SUBROUTINE
 
 !PARSE-TREE: OmpBeginDirective
 !PARSE-TREE: | OmpDirectiveName -> llvm::omp::Directive = target
 !PARSE-TREE: | OmpClauseList -> OmpClause -> DynGroupprivate -> OmpDynGroupprivateClause
-!PARSE-TREE: | | Modifier -> OmpPrescriptiveness -> Value = Fallback
+!PARSE-TREE: | | Modifier -> OmpFallbackModifier -> Value = Default_Mem
 !PARSE-TREE: | | Modifier -> OmpAccessGroup -> Value = Cgroup
 !PARSE-TREE: | | Scalar -> Integer -> Expr = 'n'
 !PARSE-TREE: | | | Designator -> DataRef -> Name = 'n'
diff --git a/llvm/include/llvm/Frontend/OpenMP/ClauseT.h b/llvm/include/llvm/Frontend/OpenMP/ClauseT.h
index d7f0e3a3d49da..a8fd51275bd21 100644
--- a/llvm/include/llvm/Frontend/OpenMP/ClauseT.h
+++ b/llvm/include/llvm/Frontend/OpenMP/ClauseT.h
@@ -242,7 +242,7 @@ ENUM(MotionExpectation, Present);
 // V5.2: [15.9.1] `task-dependence-type` modifier
 ENUM(DependenceType, Depobj, In, Inout, Inoutset, Mutexinoutset, Out, Sink,
      Source);
-ENUM(Prescriptiveness, Strict, Fallback);
+ENUM(Prescriptiveness, Strict);
 
 template <typename I, typename E> //
 struct LoopIterationT {
@@ -587,10 +587,10 @@ struct DynamicAllocatorsT {
 template <typename T, typename I, typename E> //
 struct DynGroupprivateT {
   ENUM(AccessGroup, Cgroup);
-  using Prescriptiveness = type::Prescriptiveness;
+  ENUM(Fallback, Abort, Default_Mem, Null);
   using Size = E;
   using TupleTrait = std::true_type;
-  std::tuple<OPT(AccessGroup), OPT(Prescriptiveness), Size> t;
+  std::tuple<OPT(AccessGroup), OPT(Fallback), Size> t;
 };
 
 // V5.2: [5.8.4] `enter` clause