diff -Nru chmlib-0.40.orig/src/chm_lib.c chmlib-0.40/src/chm_lib.c
--- chmlib-0.40.orig/src/chm_lib.c	2023-07-16 06:56:21.840221641 +0000
+++ chmlib-0.40/src/chm_lib.c	2023-07-16 07:46:45.948571635 +0000
@@ -164,7 +164,7 @@
 
 /* x86-64 */
 /* Note that these may be appropriate for other 64-bit machines. */
-#elif __aarch64__ || __x86_64__ || __ia64__
+#elif __aarch64__ || __x86_64__ || __ia64__ || __loongarch64
 typedef unsigned char           UChar;
 typedef short                   Int16;
 typedef unsigned short          UInt16;