diff --git a/tests/cefclient/util.h b/tests/cefclient/util.h
index ba0305c1c..4d9845772 100644
--- a/tests/cefclient/util.h
+++ b/tests/cefclient/util.h
@@ -6,6 +6,10 @@
 #define CEF_TESTS_CEFCLIENT_UTIL_H_
 #pragma once
 
+#include <cstring>
+#include <string>
+#include <vector>
+
 #include "include/cef_task.h"
 
 #if defined(OS_WIN)
@@ -34,4 +38,28 @@
 #define REQUIRE_IO_THREAD()   ASSERT(CefCurrentlyOn(TID_IO));
 #define REQUIRE_FILE_THREAD() ASSERT(CefCurrentlyOn(TID_FILE));
 
+// Helper class to manage a scoped copy of |argv|.
+class ScopedArgArray {
+ public:
+  ScopedArgArray(int argc, char* argv[]) {
+    array_ = new char*[argc];
+    for (int i = 0; i < argc; ++i) {
+      values_.push_back(argv[i]);
+      array_[i] = const_cast<char*>(values_[i].c_str());
+    }
+  }
+  ~ScopedArgArray() {
+    delete [] array_;
+  }
+
+  char** array() const { return array_; }
+
+ private:
+  char** array_;
+
+  // Keep values in a vector separate from |array_| because various users may
+  // modify |array_| and we still want to clean up memory properly.
+  std::vector<std::string> values_;
+};
+
 #endif  // CEF_TESTS_CEFCLIENT_UTIL_H_
diff --git a/tests/unittests/run_all_unittests.cc b/tests/unittests/run_all_unittests.cc
index 7c1f6ee2f..4753debf6 100644
--- a/tests/unittests/run_all_unittests.cc
+++ b/tests/unittests/run_all_unittests.cc
@@ -5,6 +5,7 @@
 #include "include/cef_app.h"
 #include "include/cef_task.h"
 #include "tests/cefclient/client_app.h"
+#include "tests/cefclient/util.h"
 #include "tests/unittests/test_handler.h"
 #include "tests/unittests/test_suite.h"
 #include "base/bind.h"
@@ -58,6 +59,15 @@ void RunTests(CefTestThread* thread) {
 
 
 int main(int argc, char* argv[]) {
+#if defined(OS_LINUX)
+  // Create a copy of |argv| on Linux because Chromium mangles the value
+  // internally (see issue #620).
+  ScopedArgArray scoped_arg_array(argc, argv);
+  char** argv_copy = scoped_arg_array.array();
+#else
+  char** argv_copy = argv;
+#endif
+
 #if defined(OS_WIN)
   CefMainArgs main_args(::GetModuleHandle(NULL));
 #else
@@ -80,7 +90,7 @@ int main(int argc, char* argv[]) {
     return exit_code;
 
   // Initialize the CommandLine object.
-  CefTestSuite::InitCommandLine(argc, argv);
+  CefTestSuite::InitCommandLine(argc, argv_copy);
 
   CefSettings settings;
   CefTestSuite::GetSettings(settings);
@@ -94,8 +104,8 @@ int main(int argc, char* argv[]) {
   // Initialize CEF.
   CefInitialize(main_args, settings, app, windows_sandbox_info);
 
-  // Create the test suite object.
-  CefTestSuite test_suite(argc, argv);
+  // Create the test suite object. TestSuite will modify |argv_copy|.
+  CefTestSuite test_suite(argc, argv_copy);
 
   int retval;
 
@@ -133,4 +143,4 @@ int main(int argc, char* argv[]) {
 #endif
 
   return retval;
-}
+}
\ No newline at end of file