diff --git a/ebtree/eb64tree.h b/ebtree/eb64tree.h
index 6d0d039..9c8feeb 100644
--- a/ebtree/eb64tree.h
+++ b/ebtree/eb64tree.h
@@ -110,12 +110,12 @@
  * The following functions are not inlined by default. They are declared
  * in eb64tree.c, which simply relies on their inline version.
  */
-REGPRM2 struct eb64_node *eb64_lookup(struct eb_root *root, u64 x);
-REGPRM2 struct eb64_node *eb64i_lookup(struct eb_root *root, s64 x);
-REGPRM2 struct eb64_node *eb64_lookup_le(struct eb_root *root, u64 x);
-REGPRM2 struct eb64_node *eb64_lookup_ge(struct eb_root *root, u64 x);
-REGPRM2 struct eb64_node *eb64_insert(struct eb_root *root, struct eb64_node *new);
-REGPRM2 struct eb64_node *eb64i_insert(struct eb_root *root, struct eb64_node *new);
+struct eb64_node *eb64_lookup(struct eb_root *root, u64 x);
+struct eb64_node *eb64i_lookup(struct eb_root *root, s64 x);
+struct eb64_node *eb64_lookup_le(struct eb_root *root, u64 x);
+struct eb64_node *eb64_lookup_ge(struct eb_root *root, u64 x);
+struct eb64_node *eb64_insert(struct eb_root *root, struct eb64_node *new);
+struct eb64_node *eb64i_insert(struct eb_root *root, struct eb64_node *new);
 
 /*
  * The following functions are less likely to be used directly, because their