diff --git a/src/internal_macros.h b/src/internal_macros.h
index 46913f41..2b3f32f3 100644
--- a/src/internal_macros.h
+++ b/src/internal_macros.h
@@ -30,9 +30,13 @@
 #elif defined(_WIN32)
 #define BENCHMARK_OS_WINDOWS 1
 #elif defined(__APPLE__)
-// TODO(ericwf) This doesn't actually check that it is a Mac OSX system. Just
-// that it is an apple system.
-#define BENCHMARK_OS_MACOSX 1
+#include "TargetConditionals.h"
+  #if defined(TARGET_OS_MAC)
+    #define BENCHMARK_OS_MACOSX 1
+    #if defined(TARGET_OS_IPHONE)
+      #define BENCHMARK_OS_IOS 1
+    #endif
+  #endif
 #elif defined(__FreeBSD__)
 #define BENCHMARK_OS_FREEBSD 1
 #elif defined(__linux__)
diff --git a/src/sysinfo.cc b/src/sysinfo.cc
index dd1e6630..34f9871c 100644
--- a/src/sysinfo.cc
+++ b/src/sysinfo.cc
@@ -295,8 +295,13 @@ void InitializeSystemInfo() {
       (size == sizeof(cpu_freq))) {
     cpuinfo_cycles_per_second = cpu_freq;
   } else {
+    #if defined BENCHMARK_OS_IOS
+    fprintf(stderr, "CPU frequency cannot be detected. \n");
+    cpuinfo_cycles_per_second = 0;
+    #else
     fprintf(stderr, "%s\n", strerror(errno));
     std::exit(EXIT_FAILURE);
+    #endif
   }
 #else
   // Generic cycles per second counter