diff --git a/ebtree/eb32sctree.h b/ebtree/eb32sctree.h
index be469baa66..9d0c997656 100644
--- a/ebtree/eb32sctree.h
+++ b/ebtree/eb32sctree.h
@@ -28,8 +28,10 @@
 #define eb32sc_entry(ptr, type, member) container_of(ptr, type, member)
 
 /* These types may sometimes already be defined */
+#ifndef _EB32TREE_H
 typedef unsigned int u32;
 typedef   signed int s32;
+#endif
 
 /* This structure carries a node, a leaf, a scope, and a key. It must start
  * with the eb_node so that it can be cast into an eb_node. We could also