diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
--- a/clang/lib/Driver/ToolChains/Flang.cpp
+++ b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -40,8 +40,6 @@
     else
       CmdArgs.push_back("-E");
   } else if (isa<CompileJobAction>(JA) || isa<BackendJobAction>(JA)) {
-    CmdArgs.push_back("-triple");
-    CmdArgs.push_back(Args.MakeArgString(TripleStr));
     if (JA.getType() == types::TY_Nothing) {
       CmdArgs.push_back("-fsyntax-only");
     } else if (JA.getType() == types::TY_AST) {
diff --git a/clang/test/Driver/flang/flang.f90 b/clang/test/Driver/flang/flang.f90
--- a/clang/test/Driver/flang/flang.f90
+++ b/clang/test/Driver/flang/flang.f90
@@ -23,7 +23,6 @@
 ! CHECK-E-DAG: "-o" "-"
 
 ! RUN: %clang --driver-mode=flang -### -emit-ast           %s 2>&1 | FileCheck --check-prefixes=ALL,CHECK-EMIT-AST %s
-! CHECK-EMIT-AST-DAG: "-triple"
 ! CHECK-EMIT-AST-DAG: "-emit-ast"
 ! CHECK-EMIT-AST-DAG: "-o" "{{[^"]*}}.ast"
 
diff --git a/clang/test/Driver/flang/flang_ucase.F90 b/clang/test/Driver/flang/flang_ucase.F90
--- a/clang/test/Driver/flang/flang_ucase.F90
+++ b/clang/test/Driver/flang/flang_ucase.F90
@@ -23,7 +23,6 @@
 ! CHECK-E-DAG: "-o" "-"
 
 ! RUN: %clang --driver-mode=flang -### -emit-ast           %s 2>&1 | FileCheck --check-prefixes=ALL,CHECK-EMIT-AST %s
-! CHECK-EMIT-AST-DAG: "-triple"
 ! CHECK-EMIT-AST-DAG: "-emit-ast"
 ! CHECK-EMIT-AST-DAG: "-o" "{{[^"]*}}.ast"