diff --git a/prism/enc/pm_encoding.h b/prism/enc/pm_encoding.h
index 777387c885..70b6d44e1c 100644
--- a/prism/enc/pm_encoding.h
+++ b/prism/enc/pm_encoding.h
@@ -170,6 +170,7 @@ extern pm_encoding_t pm_encoding_ibm737;
 extern pm_encoding_t pm_encoding_ibm775;
 extern pm_encoding_t pm_encoding_ibm852;
 extern pm_encoding_t pm_encoding_ibm855;
+extern pm_encoding_t pm_encoding_ibm857;
 extern pm_encoding_t pm_encoding_iso_8859_1;
 extern pm_encoding_t pm_encoding_iso_8859_2;
 extern pm_encoding_t pm_encoding_iso_8859_3;
diff --git a/prism/enc/pm_tables.c b/prism/enc/pm_tables.c
index ab4ac358e4..2c9c5cecda 100644
--- a/prism/enc/pm_tables.c
+++ b/prism/enc/pm_tables.c
@@ -240,6 +240,30 @@ static uint8_t pm_encoding_ibm855_table[256] = {
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Fx
 };
 
+/**
+ * Each element of the following table contains a bitfield that indicates a
+ * piece of information about the corresponding IBM857 character.
+ */
+static uint8_t pm_encoding_ibm857_table[256] = {
+//  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 1x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 2x
+    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, // 3x
+    0, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, // 4x
+    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 0, 0, 0, 0, 0, // 5x
+    0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 6x
+    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, 0, // 7x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 8x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 9x
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ax
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Bx
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Cx
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Dx
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ex
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Fx
+};
+
 /**
  * Each element of the following table contains a bitfield that indicates a
  * piece of information about the corresponding ISO-8859-1 character.
@@ -914,6 +938,7 @@ PRISM_ENCODING_TABLE(ibm737)
 PRISM_ENCODING_TABLE(ibm775)
 PRISM_ENCODING_TABLE(ibm852)
 PRISM_ENCODING_TABLE(ibm855)
+PRISM_ENCODING_TABLE(ibm857)
 PRISM_ENCODING_TABLE(iso_8859_1)
 PRISM_ENCODING_TABLE(iso_8859_2)
 PRISM_ENCODING_TABLE(iso_8859_3)
@@ -1052,6 +1077,16 @@ pm_encoding_t pm_encoding_ibm855 = {
     .multibyte = false
 };
 
+/** IBM857 */
+pm_encoding_t pm_encoding_ibm857 = {
+    .name = "IBM857",
+    .char_width = pm_encoding_single_char_width,
+    .alnum_char = pm_encoding_ibm857_alnum_char,
+    .alpha_char = pm_encoding_ibm857_alpha_char,
+    .isupper_char = pm_encoding_ibm857_isupper_char,
+    .multibyte = false
+};
+
 /** ISO-8859-1 */
 pm_encoding_t pm_encoding_iso_8859_1 = {
     .name = "ISO-8859-1",
diff --git a/prism/prism.c b/prism/prism.c
index d6b9e28a73..6f1f68a179 100644
--- a/prism/prism.c
+++ b/prism/prism.c
@@ -6071,6 +6071,7 @@ parser_lex_magic_comment_encoding_value(pm_parser_t *parser, const uint8_t *star
                 ENCODING1("CP850", pm_encoding_cp850);
                 ENCODING1("CP852", pm_encoding_cp852);
                 ENCODING1("CP855", pm_encoding_cp855);
+                ENCODING1("CP857", pm_encoding_ibm857);
                 ENCODING1("CP878", pm_encoding_koi8_r);
                 ENCODING2("CP932", "csWindows31J", pm_encoding_windows_31j);
                 ENCODING1("CP936", pm_encoding_gbk);
@@ -6104,6 +6105,7 @@ parser_lex_magic_comment_encoding_value(pm_parser_t *parser, const uint8_t *star
                 ENCODING1("IBM850", pm_encoding_cp850);
                 ENCODING1("IBM852", pm_encoding_ibm852);
                 ENCODING1("IBM855", pm_encoding_ibm855);
+                ENCODING1("IBM857", pm_encoding_ibm857);
                 ENCODING2("ISO-8859-1", "ISO8859-1", pm_encoding_iso_8859_1);
                 ENCODING2("ISO-8859-2", "ISO8859-2", pm_encoding_iso_8859_2);
                 ENCODING2("ISO-8859-3", "ISO8859-3", pm_encoding_iso_8859_3);
diff --git a/test/prism/encoding_test.rb b/test/prism/encoding_test.rb
index fe2c33febb..d8301f794e 100644
--- a/test/prism/encoding_test.rb
+++ b/test/prism/encoding_test.rb
@@ -20,6 +20,7 @@ module Prism
       Encoding::IBM775,
       Encoding::IBM852,
       Encoding::IBM855,
+      Encoding::IBM857,
       Encoding::ISO_8859_1,
       Encoding::ISO_8859_2,
       Encoding::ISO_8859_3,