diff --git a/src/lj_target_s390x.h b/src/lj_target_s390x.h
index 27bb3496..551bb7d4 100644
--- a/src/lj_target_s390x.h
+++ b/src/lj_target_s390x.h
@@ -154,27 +154,27 @@ typedef struct {
 #define ARMF_RSH(sh, r)	(0x10 | ((sh) << 5) | ARMF_S(r))
 
 typedef enum S390xIns {
-  S390I_SR = 0x1B000000,
-  S390I_AR = 0x1A000000,
-  S390I_NR = 0x14000000,
-  S390I_XR = 0x17000000,
-  S390I_MR = 0x1C000000,
-  S390I_LR = 0x18000000,
-  S390I_C = 0x59000000,
-  S390I_LH = 0x48000000,
-  S390I_BASR = 0x0D000000,
-  S390I_MVCL = 0x0e000000,
-  S390I_ST = 0x50000000,
-  S390I_TM = 0x91000000,
-  S390I_MP = 0xbd000090,
-  S390I_CLR = 0x15000000,
+  S390I_SR = 0x1B00000000000000,
+  S390I_AR = 0x1A00000000000000,
+  S390I_NR = 0x1400000000000000,
+  S390I_XR = 0x1700000000000000,
+  S390I_MR = 0x1C00000000000000,
+  S390I_LR = 0x1800000000000000,
+  S390I_C = 0x5900000000000000,
+  S390I_LH = 0x4800000000000000,
+  S390I_BASR = 0x0D00000000000000,
+  S390I_MVCL = 0x0e00000000000000,
+  S390I_ST = 0x5000000000000000,
+  S390I_TM = 0x9100000000000000,
+  S390I_MP = 0xbd00009000000000,
+  S390I_CLR = 0x1500000000000000,
 } S390xIns;
 
 typedef enum S390xShift {
   S390SH_SLL, S390SH_SRL, S390SH_SRA
 } S390xShift;
 
-/* ARM condition codes. */
+/* S390x condition codes. */
 typedef enum S390xCC {
   
 } S390xCC;