diff -ur ucon64-2.2.1-src/src/libdiscmage/misc.c ucon64-2.2.1-src.patched/src/libdiscmage/misc.c
--- ucon64-2.2.1-src/src/libdiscmage/misc.c	2020-07-03 17:13:04.000000000 +0900
+++ ucon64-2.2.1-src.patched/src/libdiscmage/misc.c	2020-12-17 02:18:00.308770100 +0900
@@ -1874,7 +1874,7 @@
 
           if (strpos == pos_1st_esc)
             setindex = 0;                       // reset argument pointer
-          if (pos_1st_esc == (unsigned int) -1)
+          if (pos_1st_esc == (size_t) -1)
             pos_1st_esc = strpos;
 
           set = sets[setindex].data;            // get next set of characters
diff -ur ucon64-2.2.1-src/src/misc/misc.c ucon64-2.2.1-src.patched/src/misc/misc.c
--- ucon64-2.2.1-src/src/misc/misc.c	2020-07-03 17:09:50.000000000 +0900
+++ ucon64-2.2.1-src.patched/src/misc/misc.c	2020-12-17 02:09:39.269112300 +0900
@@ -501,7 +501,7 @@
 
           if (strpos == pos_1st_esc)
             setindex = 0;                       // reset argument pointer
-          if (pos_1st_esc == (unsigned int) -1)
+          if (pos_1st_esc == (size_t) -1)
             pos_1st_esc = strpos;
 
           set = sets[setindex].data;            // get next set of characters