diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
index 82a7a2cc3f1ef4..1fdd272dcbeceb 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
@@ -637,7 +637,7 @@ void ClangASTSource::FindExternalVisibleDecls(
     FindDeclInModules(context, name);
   }
 
-  if (!context.m_found_type) {
+  if (!context.m_found_type && m_ast_context->getLangOpts().ObjC) {
     FindDeclInObjCRuntime(context, name);
   }
 }
diff --git a/lldb/test/API/lang/objcxx/objc-from-cpp-frames-without-debuginfo/TestObjCFromCppFramesWithoutDebugInfo.py b/lldb/test/API/lang/objcxx/objc-from-cpp-frames-without-debuginfo/TestObjCFromCppFramesWithoutDebugInfo.py
index ef8d5540fa4ef9..497c0dd128f489 100644
--- a/lldb/test/API/lang/objcxx/objc-from-cpp-frames-without-debuginfo/TestObjCFromCppFramesWithoutDebugInfo.py
+++ b/lldb/test/API/lang/objcxx/objc-from-cpp-frames-without-debuginfo/TestObjCFromCppFramesWithoutDebugInfo.py
@@ -15,4 +15,11 @@ def test(self):
         (_, process, _, _) = lldbutil.run_to_name_breakpoint(self, "main")
 
         self.assertState(process.GetState(), lldb.eStateStopped)
+
+        # Tests that we can use builtin Objective-C identifiers.
         self.expect("expr id", error=False)
+
+        # Tests that we can lookup Objective-C decls in the ObjC runtime plugin.
+        self.expect_expr(
+            "NSString *c; c == nullptr", result_value="true", result_type="bool"
+        )
diff --git a/lldb/test/API/macosx/early-process-launch/TestEarlyProcessLaunch.py b/lldb/test/API/macosx/early-process-launch/TestEarlyProcessLaunch.py
index 32a7bc82f47455..c15abbabc23741 100644
--- a/lldb/test/API/macosx/early-process-launch/TestEarlyProcessLaunch.py
+++ b/lldb/test/API/macosx/early-process-launch/TestEarlyProcessLaunch.py
@@ -38,14 +38,14 @@ def test_early_process_launch(self):
         logfile_early = os.path.join(self.getBuildDir(), "types-log-early.txt")
         self.addTearDownHook(lambda: self.runCmd("log disable lldb types"))
         self.runCmd("log enable -f %s lldb types" % logfile_early)
-        self.runCmd("expression global = 15")
+        self.runCmd("expression --language objc -- global = 15")
 
         err = process.Continue()
         self.assertTrue(err.Success())
 
         logfile_later = os.path.join(self.getBuildDir(), "types-log-later.txt")
         self.runCmd("log enable -f %s lldb types" % logfile_later)
-        self.runCmd("expression global = 25")
+        self.runCmd("expression --language objc -- global = 25")
 
         self.assertTrue(os.path.exists(logfile_early))
         self.assertTrue(os.path.exists(logfile_later))
diff --git a/lldb/test/Shell/Expr/TestObjCInCXXContext.test b/lldb/test/Shell/Expr/TestObjCInCXXContext.test
new file mode 100644
index 00000000000000..8537799bdeb674
--- /dev/null
+++ b/lldb/test/Shell/Expr/TestObjCInCXXContext.test
@@ -0,0 +1,21 @@
+// UNSUPPORTED: system-linux, system-windows
+
+// Tests that we don't consult the the Objective-C runtime
+// plugin when in a purely C++ context.
+//
+// RUN: %clangxx_host %p/Inputs/objc-cast.cpp -g -o %t
+// RUN: %lldb %t \
+// RUN:   -o "b main" -o run \
+// RUN:   -o "expression --language objective-c -- NSString * a; a" \
+// RUN:   -o "expression --language objective-c++ -- NSString * b; b" \
+// RUN:   -o "expression NSString" \
+// RUN:   2>&1 | FileCheck %s
+
+// CHECK:      (lldb) expression --language objective-c -- NSString * a; a
+// CHECK-NEXT: (NSString *){{.*}}= nil
+
+// CHECK:      (lldb) expression --language objective-c++ -- NSString * b; b
+// CHECK-NEXT: (NSString *){{.*}}= nil
+
+// CHECK:      (lldb) expression NSString
+// CHECK-NEXT: error:{{.*}} use of undeclared identifier 'NSString'