diff --git a/llvm/include/llvm/Frontend/OpenACC/ACC.td b/llvm/include/llvm/Frontend/OpenACC/ACC.td
--- a/llvm/include/llvm/Frontend/OpenACC/ACC.td
+++ b/llvm/include/llvm/Frontend/OpenACC/ACC.td
@@ -338,6 +338,7 @@
     VersionedClause<ACCC_Present>,
     VersionedClause<ACCC_Private>,
     VersionedClause<ACCC_FirstPrivate>,
+    VersionedClause<ACCC_Reduction>,
     VersionedClause<ACCC_Wait>
   ];
   let allowedOnceClauses = [
@@ -346,7 +347,6 @@
     VersionedClause<ACCC_If>,
     VersionedClause<ACCC_NumGangs>,
     VersionedClause<ACCC_NumWorkers>,
-    VersionedClause<ACCC_Reduction>,
     VersionedClause<ACCC_Self>,
     VersionedClause<ACCC_VectorLength>
   ];
@@ -368,13 +368,13 @@
     VersionedClause<ACCC_Present>,
     VersionedClause<ACCC_Private>,
     VersionedClause<ACCC_FirstPrivate>,
+    VersionedClause<ACCC_Reduction>,
     VersionedClause<ACCC_Wait>
   ];
   let allowedOnceClauses = [
     VersionedClause<ACCC_Async>,
     VersionedClause<ACCC_Default>,
     VersionedClause<ACCC_If>,
-    VersionedClause<ACCC_Reduction>,
     VersionedClause<ACCC_Self>
   ];
 }
@@ -383,12 +383,12 @@
 def ACC_Loop : Directive<"loop"> {
   let allowedClauses = [
     VersionedClause<ACCC_DeviceType>,
-    VersionedClause<ACCC_Private>
+    VersionedClause<ACCC_Private>,
+    VersionedClause<ACCC_Reduction>
   ];
   let allowedOnceClauses = [
     VersionedClause<ACCC_Collapse>,
     VersionedClause<ACCC_Gang>,
-    VersionedClause<ACCC_Reduction>,
     VersionedClause<ACCC_Tile>,
     VersionedClause<ACCC_Vector>,
     VersionedClause<ACCC_Worker>
@@ -535,6 +535,7 @@
     VersionedClause<ACCC_NoCreate>,
     VersionedClause<ACCC_Present>,
     VersionedClause<ACCC_Private>,
+    VersionedClause<ACCC_Reduction>,
     VersionedClause<ACCC_DevicePtr>,
     VersionedClause<ACCC_Attach>,
     VersionedClause<ACCC_Wait>
@@ -547,7 +548,6 @@
     VersionedClause<ACCC_If>,
     VersionedClause<ACCC_NumGangs>,
     VersionedClause<ACCC_NumWorkers>,
-    VersionedClause<ACCC_Reduction>,
     VersionedClause<ACCC_Self>,
     VersionedClause<ACCC_Tile>,
     VersionedClause<ACCC_Vector>,
@@ -575,6 +575,7 @@
     VersionedClause<ACCC_NoCreate>,
     VersionedClause<ACCC_Present>,
     VersionedClause<ACCC_Private>,
+    VersionedClause<ACCC_Reduction>,
     VersionedClause<ACCC_Tile>,
     VersionedClause<ACCC_Wait>
   ];
@@ -586,7 +587,6 @@
     VersionedClause<ACCC_If>,
     VersionedClause<ACCC_NumGangs>,
     VersionedClause<ACCC_NumWorkers>,
-    VersionedClause<ACCC_Reduction>,
     VersionedClause<ACCC_Self>,
     VersionedClause<ACCC_Vector>,
     VersionedClause<ACCC_VectorLength>,
@@ -613,6 +613,7 @@
     VersionedClause<ACCC_NoCreate>,
     VersionedClause<ACCC_Present>,
     VersionedClause<ACCC_Private>,
+    VersionedClause<ACCC_Reduction>,
     VersionedClause<ACCC_Wait>
   ];
   let allowedOnceClauses = [
@@ -621,7 +622,6 @@
     VersionedClause<ACCC_Default>,
     VersionedClause<ACCC_Gang>,
     VersionedClause<ACCC_If>,
-    VersionedClause<ACCC_Reduction>,
     VersionedClause<ACCC_Self>,
     VersionedClause<ACCC_Tile>,
     VersionedClause<ACCC_Vector>,