diff --git a/clang/lib/AST/OpenMPClause.cpp b/clang/lib/AST/OpenMPClause.cpp
index c7e7f33..b1f9ad1 100644
--- a/clang/lib/AST/OpenMPClause.cpp
+++ b/clang/lib/AST/OpenMPClause.cpp
@@ -116,6 +116,7 @@
   case OMPC_update:
   case OMPC_capture:
   case OMPC_seq_cst:
+  case OMPC_acq_rel:
   case OMPC_depend:
   case OMPC_threads:
   case OMPC_simd:
@@ -190,6 +191,7 @@
   case OMPC_update:
   case OMPC_capture:
   case OMPC_seq_cst:
+  case OMPC_acq_rel:
   case OMPC_depend:
   case OMPC_device:
   case OMPC_threads:
@@ -1334,6 +1336,10 @@
   OS << "seq_cst";
 }
 
+void OMPClausePrinter::VisitOMPAcqRelClause(OMPAcqRelClause *) {
+  OS << "acq_rel";
+}
+
 void OMPClausePrinter::VisitOMPThreadsClause(OMPThreadsClause *) {
   OS << "threads";
 }