diff --git a/utest.h b/utest.h
index 1cbe3df..b610804 100644
--- a/utest.h
+++ b/utest.h
@@ -56,21 +56,25 @@
 #pragma warning(pop)
 
 #elif defined(__linux__)
+
 // slightly obscure include here - we need to include glibc's features.h, but 
 // we don't want to just include a header that might not be defined for other 
 // c libraries like musl. Instead we include limits.h, which we know on all 
 // glibc distributions includes features.h
 #include <limits.h>
 
-#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) && \
-  ((2 < __GLIBC__) || ((2 == __GLIBC__) && (17 <= __GLIBC_MINOR__)))
-// glibc is version 2.17 or above, so we can just use clock_gettime
+#if defined(__GLIBC__) && defined(__GLIBC_MINOR__)
 #include <time.h>
-#define UTEST_USE_CLOCKGETTIME
-#endif
 
-#else
-#error Unknown platform!
+#if ((2 < __GLIBC__) || ((2 == __GLIBC__) && (17 <= __GLIBC_MINOR__)))
+// glibc is version 2.17 or above, so we can just use clock_gettime
+#define UTEST_USE_CLOCKGETTIME
+#else // ((2 < __GLIBC__) || ((2 == __GLIBC__) && (17 <= __GLIBC_MINOR__)))
+#include <unistd.h>
+#include <sys/syscall.h>
+#endif // ((2 < __GLIBC__) || ((2 == __GLIBC__) && (17 <= __GLIBC_MINOR__)))
+#endif // defined(__GLIBC__) && defined(__GLIBC_MINOR__)
+
 #endif
 
 #if defined(_MSC_VER)
@@ -83,7 +87,7 @@
   static void __cdecl f(void)
 #else
 #define UTEST_INLINE inline
-  
+
 #define UTEST_INITIALIZER(f)                                                   \
   static void f(void) __attribute__((constructor));                            \
   static void f(void)
@@ -103,14 +107,14 @@
 #if defined(_MSC_VER)
   return 0;
 #elif defined(__linux)
-#if defined(UTEST_USE_CLOCKGETTIME)
   struct timespec ts;
-  clock_gettime(CLOCK_REALTIME, &ts);
-  return UTEST_CAST(long, ts.tv_sec) * 1000 * 1000 * 1000 + ts.tv_nsec;
+  const clockid_t cid = CLOCK_REALTIME;
+#if defined(UTEST_USE_CLOCKGETTIME)
+  clock_gettime(cid, &ts);
 #else
-  // no support yet on linux for glibc < 2.17
-  return 0;
+  syscall(SYS_clock_gettime, cid, &ts);
 #endif
+  return UTEST_CAST(long, ts.tv_sec) * 1000 * 1000 * 1000 + ts.tv_nsec;
 #endif
 }