diff --git a/src/lib.rs b/src/lib.rs
index 75462a6..4a41a46 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -57,6 +57,11 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
 
             let target_endpoint = &mut self.ep_table[address.index()];
 
+            // Set endpoint parameters. //
+
+            target_endpoint.set_dir(ep_dir);
+            target_endpoint.set_type(ep_type);
+
             // Get power of two number of endpoint size. //
 
             let ep_size = max(8, max_packet_size.next_power_of_two());
@@ -66,14 +71,10 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
             if DPRAM_SIZE - self.dpram_already_used < ep_size {
                 Err(UsbError::EndpointMemoryOverflow)
             } else {
-                // Set endpoint parameters. //
-
-                target_endpoint.set_dir(ep_dir);
-                target_endpoint.set_type(ep_type);
-                target_endpoint.set_size(ep_size)?;
-
                 // Add used dpram memory. //
 
+                target_endpoint.set_size(ep_size)?;
+
                 target_endpoint.is_allocated = true;
                 self.dpram_already_used += ep_size;