diff --git a/src/easylogging++.cc b/src/easylogging++.cc
index 4a8d92731..e2c6438fd 100644
--- a/src/easylogging++.cc
+++ b/src/easylogging++.cc
@@ -745,6 +745,13 @@ base::type::fstream_t* File::newFileStream(const std::string& filename) {
 #endif  // defined(ELPP_UNICODE)
   if (fs->is_open()) {
     fs->flush();
+#if defined(ELPP_STRICT_PERMISSIONS)
+    if (filename != "/dev/null" && filename != "nul") {
+      fs::permissions(filename,
+                  fs::perms::owner_read | fs::perms::owner_write | fs::perms::group_read,
+                  fs::perm_options::replace);
+    }
+#endif
   } else {
     base::utils::safeDelete(fs);
     ELPP_INTERNAL_ERROR("Bad file [" << filename << "]", true);
diff --git a/src/easylogging++.h b/src/easylogging++.h
index 6e81edfbc..d95ecc627 100644
--- a/src/easylogging++.h
+++ b/src/easylogging++.h
@@ -461,6 +461,38 @@ ELPP_INTERNAL_DEBUGGING_OUT_INFO << ELPP_INTERNAL_DEBUGGING_MSG(internalInfoStre
 // For logging wxWidgets based classes & templates
 #   include <wx/vector.h>
 #endif  // defined(ELPP_WXWIDGETS_LOGGING)
+#if defined(ELPP_STRICT_PERMISSIONS)
+// Need to check for Boost first because Mojave *has* std::filesystem,
+// but won't let you use it.
+#ifdef __APPLE__
+#include <Availability.h>
+#endif
+
+#if defined(__APPLE__) && __MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_15
+#if __has_include(<boost/filesystem.hpp>)
+#include <boost/filesystem.hpp>
+namespace fs = boost::filesystem;
+#else
+#include <filesystem>
+namespace fs = std::filesystem;
+#endif
+#else
+// For non-Apple systems, prefer std::filesystem
+// Otherwise, older versions of boost cause failures.
+#if __has_include(<filesystem>)
+#include <filesystem>
+namespace fs = std::filesystem;
+#elif __has_include(<experimental/filesystem>)
+#include <experimental/filesystem>
+namespace fs = std::experimental;
+#elif __has_include(<boost/filesystem>)
+#include <boost/filesystem>
+namespace fs = boost::filesystem
+#else
+#pragma message "No filesystem library found."
+#endif
+#endif
+#endif
 #if defined(ELPP_UTC_DATETIME)
 #   define elpptime_r gmtime_r
 #   define elpptime_s gmtime_s