diff --git a/Core/Time.h b/Core/Time.h
index 7e8c679c..72256570 100644
--- a/Core/Time.h
+++ b/Core/Time.h
@@ -236,9 +236,15 @@ static __inline __attribute__((always_inline))
 uint64_t
 rdtsc()
 {
+#if defined(__i386) || defined(__x86_64__)
     uint32_t lo, hi;
     __asm__ __volatile__("rdtsc" : "=a" (lo), "=d" (hi));
     return ((uint64_t(hi) << 32) | lo);
+#elif defined(__powerpc64__)
+    return (__builtin_ppc_get_timebase());
+#else
+#error "Unsupported platform."
+#endif
 }
 
 /**
diff --git a/Core/TimeTest.cc b/Core/TimeTest.cc
index 56b4cf80..5f8a01db 100644
--- a/Core/TimeTest.cc
+++ b/Core/TimeTest.cc
@@ -257,7 +257,13 @@ TEST(CoreTime, rdtsc_progressTimingSensitive) {
     usleep(1000);
     uint64_t b = Time::rdtsc();
     EXPECT_LT(a, b);
+#if defined(__i386) || defined(__x86_64__)
     EXPECT_LT(a + 1000 * 1000, b);
+#elif defined(__powerpc64__)
+    EXPECT_LT(a + 1000 * 500, b);
+#else
+#error "Unsupported platform."
+#endif
     EXPECT_LT(b, a + 10 * 1000 * 1000);
 }