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-rw-r--r--debug_counter.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/debug_counter.h b/debug_counter.h
index 066533d1d1..eb313fc838 100644
--- a/debug_counter.h
+++ b/debug_counter.h
@@ -341,6 +341,10 @@ RB_DEBUG_COUNTER(load_path_is_not_realpath)
#ifndef RUBY_DEBUG_COUNTER_H
#define RUBY_DEBUG_COUNTER_H 1
+#include "ruby/config.h"
+#include <stddef.h> /* for size_t */
+#include "ruby/ruby.h" /* for VALUE */
+
#if !defined(__GNUC__) && USE_DEBUG_COUNTER
#error "USE_DEBUG_COUNTER is not supported by other than __GNUC__"
#endif