diff --git a/bin/dd/args.c b/bin/dd/args.c
--- a/bin/dd/args.c
+++ b/bin/dd/args.c
@@ -359,13 +359,13 @@
 	{ "ebcdic",	C_EBCDIC,	C_ASCII,	a2e_POSIX },
 	{ "fdatasync",	C_FDATASYNC,	0,		NULL },
 	{ "fsync",	C_FSYNC,	0,		NULL },
-	{ "ibm",	C_EBCDIC,	C_ASCII,	a2ibm_POSIX },
+	{ "ibm",	C_EBCDIC,	C_ASCII,	a2ibm },
 	{ "lcase",	C_LCASE,	C_UCASE,	NULL },
 	{ "noerror",	C_NOERROR,	0,		NULL },
 	{ "notrunc",	C_NOTRUNC,	0,		NULL },
 	{ "oldascii",	C_ASCII,	C_EBCDIC,	e2a_32V },
 	{ "oldebcdic",	C_EBCDIC,	C_ASCII,	a2e_32V },
-	{ "oldibm",	C_EBCDIC,	C_ASCII,	a2ibm_32V },
+	{ "oldibm",	C_EBCDIC,	C_ASCII,	a2ibm },
 	{ "osync",	C_OSYNC,	C_BS,		NULL },
 	{ "pareven",	C_PAREVEN,	C_PARODD|C_PARSET|C_PARNONE, NULL},
 	{ "parnone",	C_PARNONE,	C_PARODD|C_PARSET|C_PAREVEN, NULL},
diff --git a/bin/dd/conv_tab.c b/bin/dd/conv_tab.c
--- a/bin/dd/conv_tab.c
+++ b/bin/dd/conv_tab.c
@@ -145,42 +145,6 @@
 	0356, 0357, 0372, 0373, 0374, 0375, 0376, 0377,		/* 0370 */
 };
 
-/* ASCII to IBM EBCDIC -- 32V compatible. */
-const u_char a2ibm_32V[] = {
-	0000, 0001, 0002, 0003, 0067, 0055, 0056, 0057,		/* 0000 */
-	0026, 0005, 0045, 0013, 0014, 0015, 0016, 0017,		/* 0010 */
-	0020, 0021, 0022, 0023, 0074, 0075, 0062, 0046,		/* 0020 */
-	0030, 0031, 0077, 0047, 0034, 0035, 0036, 0037,		/* 0030 */
-	0100, 0132, 0177, 0173, 0133, 0154, 0120, 0175,		/* 0040 */
-	0115, 0135, 0134, 0116, 0153, 0140, 0113, 0141,		/* 0050 */
-	0360, 0361, 0362, 0363, 0364, 0365, 0366, 0367,		/* 0060 */
-	0370, 0371, 0172, 0136, 0114, 0176, 0156, 0157,		/* 0070 */
-	0174, 0301, 0302, 0303, 0304, 0305, 0306, 0307,		/* 0100 */
-	0310, 0311, 0321, 0322, 0323, 0324, 0325, 0326,		/* 0110 */
-	0327, 0330, 0331, 0342, 0343, 0344, 0345, 0346,		/* 0120 */
-	0347, 0350, 0351, 0255, 0340, 0275, 0137, 0155,		/* 0130 */
-	0171, 0201, 0202, 0203, 0204, 0205, 0206, 0207,		/* 0140 */
-	0210, 0211, 0221, 0222, 0223, 0224, 0225, 0226,		/* 0150 */
-	0227, 0230, 0231, 0242, 0243, 0244, 0245, 0246,		/* 0160 */
-	0247, 0250, 0251, 0300, 0117, 0320, 0241, 0007,		/* 0170 */
-	0040, 0041, 0042, 0043, 0044, 0025, 0006, 0027,		/* 0200 */
-	0050, 0051, 0052, 0053, 0054, 0011, 0012, 0033,		/* 0210 */
-	0060, 0061, 0032, 0063, 0064, 0065, 0066, 0010,		/* 0220 */
-	0070, 0071, 0072, 0073, 0004, 0024, 0076, 0341,		/* 0230 */
-	0101, 0102, 0103, 0104, 0105, 0106, 0107, 0110,		/* 0240 */
-	0111, 0121, 0122, 0123, 0124, 0125, 0126, 0127,		/* 0250 */
-	0130, 0131, 0142, 0143, 0144, 0145, 0146, 0147,		/* 0260 */
-	0150, 0151, 0160, 0161, 0162, 0163, 0164, 0165,		/* 0270 */
-	0166, 0167, 0170, 0200, 0212, 0213, 0214, 0215,		/* 0300 */
-	0216, 0217, 0220, 0232, 0233, 0234, 0235, 0236,		/* 0310 */
-	0237, 0240, 0252, 0253, 0254, 0255, 0256, 0257,		/* 0320 */
-	0260, 0261, 0262, 0263, 0264, 0265, 0266, 0267,		/* 0330 */
-	0270, 0271, 0272, 0273, 0274, 0275, 0276, 0277,		/* 0340 */
-	0312, 0313, 0314, 0315, 0316, 0317, 0332, 0333,		/* 0350 */
-	0334, 0335, 0336, 0337, 0352, 0353, 0354, 0355,		/* 0360 */
-	0356, 0357, 0372, 0373, 0374, 0375, 0376, 0377,		/* 0370 */
-};
-
 /* EBCDIC to ASCII -- POSIX and System V compatible. */
 const u_char e2a_POSIX[] = {
 	0000, 0001, 0002, 0003, 0234, 0011, 0206, 0177,		/* 0000 */
@@ -254,7 +218,7 @@
 };
 
 /* ASCII to IBM EBCDIC -- POSIX and System V compatible. */
-const u_char a2ibm_POSIX[] = {
+const u_char a2ibm[] = {
 	0000, 0001, 0002, 0003, 0067, 0055, 0056, 0057,		/* 0000 */
 	0026, 0005, 0045, 0013, 0014, 0015, 0016, 0017,		/* 0010 */
 	0020, 0021, 0022, 0023, 0074, 0075, 0062, 0046,		/* 0020 */
diff --git a/bin/dd/extern.h b/bin/dd/extern.h
--- a/bin/dd/extern.h
+++ b/bin/dd/extern.h
@@ -65,7 +65,7 @@
 extern const u_char *ctab;
 extern const u_char a2e_32V[], a2e_POSIX[];
 extern const u_char e2a_32V[], e2a_POSIX[];
-extern const u_char a2ibm_32V[], a2ibm_POSIX[];
+extern const u_char a2ibm[];
 extern u_char casetab[];
 extern char fill_char;
 extern volatile sig_atomic_t need_summary;