diff --git a/dynasm/dasm_s390x.lua b/dynasm/dasm_s390x.lua
index 3a5c5000..4c716eec 100644
--- a/dynasm/dasm_s390x.lua
+++ b/dynasm/dasm_s390x.lua
@@ -540,7 +540,7 @@ map_op = {
   nihf_2 =	"c00a00000000n",
   nilf_2 =	"c00b00000000n",
   bal_2 =	"000045000000j",
-  balr_2 =	"00000000500g",
+  balr_2 =	"000000000500g",
   bas_2 =	"00004d000000j",
   basr_2 =	"000000000d00g",
   bassm_2 =	"000000000c00g",
@@ -549,9 +549,9 @@ map_op = {
   bakr_2 =	"0000b2400000h",
   bsg_2 =	"0000b2580000h",
   bc_2 =	"000047000000k",
-  bcr_2 =	"00000000700g",
+  bcr_2 =	"000000000700g",
   bct_2 =	"000046000000j",
-  bctr_2 =	"00000000600g",
+  bctr_2 =	"000000000600g",
   bctg_2 =	"e30000000046l",
   bctgr_2 =	"0000b9460000h",
   bxh_3 =	"000086000000q",
@@ -953,7 +953,7 @@ map_op = {
   sar_2 =	"0000b24e0000h",
   sfpc_2 =	"0000b3840000h",
   sfasr_2 =	"0000b3850000h",
-  spm_2 =	"00000000400g",
+  spm_2 =	"000000000400g",
   ssar_2 =	"0000b2250000h",
   ssair_2 =	"0000b99f0000h",
   slda_3 =	"00008f000000q",