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-rw-r--r--ext/objspace/objspace.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/objspace/objspace.c b/ext/objspace/objspace.c
index e61eda8..8e8b29f 100644
--- a/ext/objspace/objspace.c
+++ b/ext/objspace/objspace.c
@@ -30,6 +30,7 @@
#include "node.h"
#include "gc.h"
#include "regint.h"
+#include "internal.h"
size_t rb_str_memsize(VALUE);
size_t rb_ary_memsize(VALUE);