Index: gc.c
===================================================================
--- gc.c.orig
+++ gc.c
@@ -425,7 +425,7 @@ unsigned int _stacksize = 262144;
 # define STACK_LEVEL_MAX (_stacksize - 4096)
 # undef HAVE_GETRLIMIT
 #elif defined(HAVE_GETRLIMIT) || defined(_WIN32)
-static unsigned int STACK_LEVEL_MAX = 655300;
+static unsigned long STACK_LEVEL_MAX = 655300;
 #else
 # define STACK_LEVEL_MAX 655300
 #endif
@@ -485,7 +485,7 @@ stack_grow_direction(addr)
     (ret) = (STACK_LENGTH > STACK_LEVEL_MAX + GC_WATER_MARK);\
 } while (0)
 
-int
+long
 ruby_stack_length(p)
     VALUE **p;
 {
Index: intern.h
===================================================================
--- intern.h.orig
+++ intern.h
@@ -238,7 +238,7 @@ VALUE rb_file_directory_p _((VALUE,VALUE
 /* gc.c */
 NORETURN(void rb_memerror __((void)));
 int ruby_stack_check _((void));
-int ruby_stack_length _((VALUE**));
+long ruby_stack_length _((VALUE**));
 char *rb_source_filename _((const char*));
 void rb_gc_mark_locations _((VALUE*, VALUE*));
 void rb_mark_tbl _((struct st_table*));