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-rw-r--r--include/ruby/intern.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/intern.h b/include/ruby/intern.h
index 243e7015a..acd8d84c6 100644
--- a/include/ruby/intern.h
+++ b/include/ruby/intern.h
@@ -330,7 +330,7 @@ VALUE rb_file_directory_p(VALUE,VALUE);
void ruby_set_stack_size(size_t);
NORETURN(void rb_memerror(void));
int ruby_stack_check(void);
-int ruby_stack_length(VALUE**);
+size_t ruby_stack_length(VALUE**);
int rb_during_gc(void);
void rb_gc_mark_locations(VALUE*, VALUE*);
void rb_mark_tbl(struct st_table*);