diff --git a/libcxx/src/chrono.cpp b/libcxx/src/chrono.cpp
--- a/libcxx/src/chrono.cpp
+++ b/libcxx/src/chrono.cpp
@@ -31,7 +31,7 @@
 # include <sys/time.h> // for gettimeofday and timeval
 #endif
 
-#if defined(__APPLE__) || (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0)
+#if defined(__APPLE__) || defined (__gnu_hurd__) || (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0)
 # define _LIBCPP_HAS_CLOCK_GETTIME
 #endif
 
diff --git a/libcxx/src/filesystem/filesystem_clock.cpp b/libcxx/src/filesystem/filesystem_clock.cpp
--- a/libcxx/src/filesystem/filesystem_clock.cpp
+++ b/libcxx/src/filesystem/filesystem_clock.cpp
@@ -29,7 +29,7 @@
 # include <sys/time.h> // for gettimeofday and timeval
 #endif
 
-#if defined(__APPLE__) || (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0)
+#if defined(__APPLE__) || defined (__gnu_hurd__) || (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0)
 # define _LIBCPP_HAS_CLOCK_GETTIME
 #endif