-#define SR_KHZ(n) ((n) * (uint64_t)(1000ULL))
-#define SR_MHZ(n) ((n) * (uint64_t)(1000000ULL))
-#define SR_GHZ(n) ((n) * (uint64_t)(1000000000ULL))
+#define SR_KHZ(n) ((n) * UINT64_C(1000))
+#define SR_MHZ(n) ((n) * UINT64_C(1000000))
+#define SR_GHZ(n) ((n) * UINT64_C(1000000000))