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-rw-r--r--src/rdxtree_i.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/rdxtree_i.h b/src/rdxtree_i.h
index 70a5f98..3b1a156 100644
--- a/src/rdxtree_i.h
+++ b/src/rdxtree_i.h
@@ -27,6 +27,7 @@
#define RDXTREE_I_H
#include <stdbool.h>
+#include <stddef.h>
/*
* Radix tree.