diff --git a/src/c/threads_win32.d b/src/c/threads_win32.d
index f0da064c5..b3ac9dd4f 100644
--- a/src/c/threads_win32.d
+++ b/src/c/threads_win32.d
@@ -135,8 +135,8 @@ initialize_process_bindings(cl_object process, cl_object initial_bindings)
 	 * bindings */
 	if (initial_bindings != OBJNULL) {
 		hash = cl__make_hash_table(@'eq', MAKE_FIXNUM(1024),
-					   make_singlefloat(1.5),
-					   make_singlefloat(0.7),
+					   ecl_make_singlefloat(1.5),
+					   ecl_make_singlefloat(0.7),
 					   Cnil); /* no need for locking */
 	} else {
 		hash = si_copy_hash_table(cl_env.bindings_hash);