diff --git a/googletest/include/gtest/internal/gtest-port-arch.h b/googletest/include/gtest/internal/gtest-port-arch.h
index 7ec968f31..a97b18f1a 100644
--- a/googletest/include/gtest/internal/gtest-port-arch.h
+++ b/googletest/include/gtest/internal/gtest-port-arch.h
@@ -84,6 +84,9 @@
 #define GTEST_OS_GNU_HURD 1
 #elif defined(__GLIBC__) && defined(__FreeBSD_kernel__)
 #define GTEST_OS_GNU_KFREEBSD 1
+#elif defined(__ZEPHYR__)
+// Define it before linux as it could be built as a linux application
+#define GTEST_OS_ZEPHYR 1
 #elif defined __linux__
 #define GTEST_OS_LINUX 1
 #if defined __ANDROID__
diff --git a/googletest/include/gtest/internal/gtest-port.h b/googletest/include/gtest/internal/gtest-port.h
index ca18513e7..7e78ccffc 100644
--- a/googletest/include/gtest/internal/gtest-port.h
+++ b/googletest/include/gtest/internal/gtest-port.h
@@ -141,6 +141,7 @@
 //     GTEST_OS_WINDOWS_PHONE    - Windows Phone
 //     GTEST_OS_WINDOWS_RT       - Windows Store App/WinRT
 //   GTEST_OS_ZOS      - z/OS
+//   GTEST_OS_ZEPHYR   - Zephyr OS
 //
 // Among the platforms, Cygwin, Linux, Mac OS X, and Windows have the
 // most stable support.  Since core members of the Google Test project
@@ -525,6 +526,10 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
 #endif
 #endif  // GTEST_HAS_STD_WSTRING
 
+#ifdef GTEST_OS_ZEPHYR
+#define GTEST_HAS_FILE_SYSTEM 0
+#endif
+
 #ifndef GTEST_HAS_FILE_SYSTEM
 // Most platforms support a file system.
 #define GTEST_HAS_FILE_SYSTEM 1
@@ -2060,6 +2065,18 @@ inline int RmDir(const char* dir) { return rmdir(dir); }
 inline bool IsDir(const StatStruct& st) { return S_ISDIR(st.st_mode); }
 #endif
 
+#elif defined(GTEST_OS_ZEPHYR)
+static inline int FileNo(FILE* file) {
+  if (file == stdin)
+    return 1;
+  else if (file == stdout)
+    return 2;
+  else if (file == stderr)
+    return 3;
+  return -EINVAL;
+}
+
+static inline int isatty(int fd) { return true; }
 #else
 
 typedef struct stat StatStruct;
diff --git a/googletest/src/gtest.cc b/googletest/src/gtest.cc
index 7ff825468..e45f8a5ec 100644
--- a/googletest/src/gtest.cc
+++ b/googletest/src/gtest.cc
@@ -43,7 +43,9 @@
 #include <algorithm>
 #include <chrono>  // NOLINT
 #include <cmath>
+#ifndef GTEST_OS_ZEPHYR
 #include <csignal>  // NOLINT: raise(3) is used on some platforms
+#endif
 #include <cstdint>
 #include <cstdlib>
 #include <cstring>
diff --git a/googletest/src/gtest_main.cc b/googletest/src/gtest_main.cc
index 8141caf4c..5f27a4bb4 100644
--- a/googletest/src/gtest_main.cc
+++ b/googletest/src/gtest_main.cc
@@ -47,8 +47,13 @@ void loop() { RUN_ALL_TESTS(); }
 }
 #endif
 
-#elif defined(GTEST_OS_QURT)
-// QuRT: program entry point is main, but argc/argv are unusable.
+#elif defined(GTEST_OS_QURT) || defined(GTEST_OS_ZEPHYR)
+// Program entry point is main, but argc/argv are unusable.
+
+#if defined(GTEST_OS_ZEPHYR)
+#undef GTEST_API_
+#define GTEST_API_
+#endif
 
 GTEST_API_ int main() {
   printf("Running main() from %s\n", __FILE__);