diff --git a/src/lib.rs b/src/lib.rs
index 4a41a46..75462a6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -57,11 +57,6 @@ 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());
@@ -71,10 +66,14 @@ impl<const L: usize> UsbBus for UsbDevice<L> {
             if DPRAM_SIZE - self.dpram_already_used < ep_size {
                 Err(UsbError::EndpointMemoryOverflow)
             } else {
-                // Add used dpram memory. //
+                // 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.is_allocated = true;
                 self.dpram_already_used += ep_size;