diff --git a/Isolate.cpp b/Isolate.cpp
index 1c2b73e..3eb63ac 100644
--- a/Isolate.cpp
+++ b/Isolate.cpp
@@ -48,7 +48,7 @@
 }
 
 static void RegisterSignalHandler() {
-  sighandler_t ret = signal(SIGINT, SignalHandler);
+  auto ret = signal(SIGINT, SignalHandler);
   if (ret == SIG_ERR) {
     PLOG(FATAL) << "Setting up SIGINT handler failed";
   }
@@ -59,7 +59,7 @@
 }
 
 static void UnregisterSignalHandler() {
-  sighandler_t ret = signal(SIGINT, SIG_DFL);
+  auto ret = signal(SIGINT, SIG_DFL);
   if (ret == SIG_ERR) {
     PLOG(FATAL) << "Disabling SIGINT handler failed";
   }
@@ -89,7 +89,11 @@
     command += " --gtest_filter=" + options_.filter();
   }
   command += " --gtest_list_tests";
+#if defined(__APPLE__)
+  FILE* fp = popen(command.c_str(), "r");
+#else
   FILE* fp = popen(command.c_str(), "re");
+#endif
   if (fp == nullptr) {
     PLOG(FATAL) << "Unexpected failure from popen";
   }
diff --git a/tests/SystemTests.cpp b/tests/SystemTests.cpp
index aa90906..61b0f13 100644
--- a/tests/SystemTests.cpp
+++ b/tests/SystemTests.cpp
@@ -87,8 +87,12 @@
 
 void SystemTests::Exec(std::vector<const char*> args) {
   int fds[2];
+#if !defined(__APPLE__)
   ASSERT_NE(-1, pipe2(fds, O_NONBLOCK));
+#else
+  ASSERT_NE(-1, pipe(fds));
   ASSERT_NE(-1, fcntl(fds[0], F_SETFL, O_NONBLOCK));
+#endif
 
   if ((pid_ = fork()) == 0) {
     // Run the test.
@@ -416,7 +420,11 @@
   std::string expected =
       "[==========] Running 1 test from 1 test case (20 jobs).\n"
       "[  FAILED  ] SystemTests.DISABLED_crash (XX ms)\n"
+#if defined(__APPLE__)
+      "SystemTests.DISABLED_crash terminated by signal: Segmentation fault: 11.\n"
+#else
       "SystemTests.DISABLED_crash terminated by signal: Segmentation fault.\n"
+#endif
       "[==========] 1 test from 1 test case ran. (XX ms total)\n"
       "[   PASS   ] 0 tests.\n"
       "[   FAIL   ] 1 test, listed below:\n"