diff --git a/examples/claim.rs b/examples/claim.rs
index 82aeaaabdfe7083d8c79abbfe93ff86cbd7d9284..90a4281f870f593e19c6854c65c618330574b074 100644
--- a/examples/claim.rs
+++ b/examples/claim.rs
@@ -2,7 +2,6 @@
 #![no_std]
 
 extern crate blue_pill;
-extern crate cortex_m;
 extern crate cortex_m_rtfm as rtfm;
 
 use blue_pill::stm32f103xx::Interrupt;
diff --git a/examples/usart1-rx-dma.rs b/examples/usart1-rx-dma.rs
index dee5fea87bc1d438382a1620922b5078e64dac1c..54659767481b4cd242cbd4fc8498024aa4dfe19a 100644
--- a/examples/usart1-rx-dma.rs
+++ b/examples/usart1-rx-dma.rs
@@ -7,7 +7,6 @@
 
 extern crate blue_pill;
 extern crate cortex_m_rtfm as rtfm;
-extern crate nb;
 
 use blue_pill::Serial;
 use blue_pill::dma::{Buffer, Dma1Channel5};
diff --git a/examples/usart1-tx-dma.rs b/examples/usart1-tx-dma.rs
index c68985108970fe544511a6171d2a1c35736c8e1e..24d26b7208b91aed42422b03b22f217ceba1cf08 100644
--- a/examples/usart1-tx-dma.rs
+++ b/examples/usart1-tx-dma.rs
@@ -7,7 +7,6 @@
 
 extern crate blue_pill;
 extern crate cortex_m_rtfm as rtfm;
-extern crate nb;
 
 use blue_pill::Serial;
 use blue_pill::dma::{Buffer, Dma1Channel4};