1 files changed, 1 insertions, 1 deletions
diff --git a/intern.h b/intern.h
index 7e72dd5537..00bb8f16b5 100644
--- a/intern.h
+++ b/intern.h
@@ -251,7 +251,7 @@ VALUE rb_file_directory_p _((VALUE,VALUE));
 /* gc.c */
 NORETURN(void rb_memerror __((void)));
 int ruby_stack_check _((void));
-int ruby_stack_length _((VALUE**));
+size_t ruby_stack_length _((VALUE**));
 int rb_during_gc _((void));
 char *rb_source_filename _((const char*));
 void rb_gc_mark_locations _((VALUE*, VALUE*));