diff --git a/libcurvecpr/lib/util.c b/libcurvecpr/lib/util.c
index 08fc8cc..baf0f58 100644
--- a/libcurvecpr/lib/util.c
+++ b/libcurvecpr/lib/util.c
@@ -61,7 +61,12 @@ long long curvecpr_util_nanoseconds (void)
 
     if (clock_get_time(cclock, &t) != KERN_SUCCESS)
         return -1;
-#else
+#elif defined(CLOCK_MONOTONIC)
+    struct timespec t;
+
+    if (clock_gettime(CLOCK_MONOTONIC, &t) != 0)
+        return -1;
+#elif defined(CLOCK_REALTIME)
     struct timespec t;
 
     if (clock_gettime(CLOCK_REALTIME, &t) != 0)
diff --git a/libcurvecpr/test/util/test_nanoseconds.c b/libcurvecpr/test/util/test_nanoseconds.c
index 28fc414..b82a187 100644
--- a/libcurvecpr/test/util/test_nanoseconds.c
+++ b/libcurvecpr/test/util/test_nanoseconds.c
@@ -8,14 +8,14 @@ START_TEST (test_nanoseconds)
     long long nanoseconds = curvecpr_util_nanoseconds();
 
     fail_if(nanoseconds < 0);
-    fail_unless(nanoseconds > 1374047000000000000LL);
+    fail_unless(nanoseconds > 0);
 
     /* On OS X, we may cache the kernel clock reference. Make sure it still
        works. */
-    nanoseconds = curvecpr_util_nanoseconds();
+    long long nanoseconds1 = curvecpr_util_nanoseconds();
 
-    fail_if(nanoseconds < 0);
-    fail_unless(nanoseconds > 1374047000000000000LL);
+    fail_if(nanoseconds1 < 0);
+    fail_unless(nanoseconds1 > nanoseconds);
 }
 END_TEST