diff --git a/inc/Registers.h b/inc/Registers.h
index 1624980..297db7f 100644
--- a/inc/Registers.h
+++ b/inc/Registers.h
@@ -49,6 +49,11 @@
 #define CSR_STVAL (0x143)
 #define CSR_SIP (0x144)
 
+#define CSR_MCYCLE (0xB00)
+#define CSR_MINSTRET (0xB02)
+#define CSR_MCYCLEH (0xB80)
+#define CSR_MINSTRETH (0xB82)
+
 #define CSR_CYCLE (0xC00)
 #define CSR_TIME (0xC01)
 #define CSR_INSTRET (0xC02)
diff --git a/src/Registers.cpp b/src/Registers.cpp
index 53c7521..bd8620e 100644
--- a/src/Registers.cpp
+++ b/src/Registers.cpp
@@ -92,10 +92,12 @@ uint32_t Registers::getCSR(int csr) {
 
   switch (csr) {
     case CSR_CYCLE:
+    case CSR_MCYCLE:
       ret_value = (uint64_t)(sc_time(sc_time_stamp()
             - sc_time(SC_ZERO_TIME)).to_double()) & 0x00000000FFFFFFFF;
       break;
     case CSR_CYCLEH:
+    case CSR_MCYCLEH:
       ret_value = (uint32_t)((uint64_t)(sc_time(sc_time_stamp()
           - sc_time(SC_ZERO_TIME)).to_double()) >> 32 & 0x00000000FFFFFFFF);
       break;