diff --git a/src/coding.h b/src/coding.h
index 438456ed400..04225a40b3b 100644
--- a/src/coding.h
+++ b/src/coding.h
@@ -541,10 +541,10 @@ extern Lisp_Object Vcoding_category_list;
 extern Lisp_Object Qtranslation_table;
 extern Lisp_Object Qtranslation_table_id;
 
-/* Mnemonic character to indicate each type of end-of-line.  */
-extern int eol_mnemonic_unix, eol_mnemonic_dos, eol_mnemonic_mac;
-/* Mnemonic character to indicate type of end-of-line is not yet decided.  */
-extern int eol_mnemonic_undecided;
+/* Mnemonic strings to indicate each type of end-of-line.  */
+extern Lisp_Object eol_mnemonic_unix, eol_mnemonic_dos, eol_mnemonic_mac;
+/* Mnemonic string to indicate type of end-of-line is not yet decided.  */
+extern Lisp_Object eol_mnemonic_undecided;
 
 #ifdef emacs
 extern Lisp_Object Qfile_coding_system;