diff --git a/ebtree/ebmbtree.h b/ebtree/ebmbtree.h
index 6ed7de4..3200a12 100644
--- a/ebtree/ebmbtree.h
+++ b/ebtree/ebmbtree.h
@@ -107,11 +107,11 @@
 /* The following functions are not inlined by default. They are declared
  * in ebmbtree.c, which simply relies on their inline version.
  */
-REGPRM3 struct ebmb_node *ebmb_lookup(struct eb_root *root, const void *x, unsigned int len);
-REGPRM3 struct ebmb_node *ebmb_insert(struct eb_root *root, struct ebmb_node *new, unsigned int len);
-REGPRM2 struct ebmb_node *ebmb_lookup_longest(struct eb_root *root, const void *x);
-REGPRM3 struct ebmb_node *ebmb_lookup_prefix(struct eb_root *root, const void *x, unsigned int pfx);
-REGPRM3 struct ebmb_node *ebmb_insert_prefix(struct eb_root *root, struct ebmb_node *new, unsigned int len);
+struct ebmb_node *ebmb_lookup(struct eb_root *root, const void *x, unsigned int len);
+struct ebmb_node *ebmb_insert(struct eb_root *root, struct ebmb_node *new, unsigned int len);
+struct ebmb_node *ebmb_lookup_longest(struct eb_root *root, const void *x);
+struct ebmb_node *ebmb_lookup_prefix(struct eb_root *root, const void *x, unsigned int pfx);
+struct ebmb_node *ebmb_insert_prefix(struct eb_root *root, struct ebmb_node *new, unsigned int len);
 
 /* The following functions are less likely to be used directly, because their
  * code is larger. The non-inlined version is preferred.