diff --git a/include/openthread.h b/include/openthread.h
index 1609d8642..fbb250c87 100644
--- a/include/openthread.h
+++ b/include/openthread.h
@@ -110,7 +110,7 @@ extern "C" {
 /**
  * Initialize the OpenThread library.
  */
-void otInit();
+void otInit(void);
 
 /**
  * Run the next queued tasklet in OpenThread.
diff --git a/src/core/thread/mesh_forwarder.cpp b/src/core/thread/mesh_forwarder.cpp
index 15bbaecc9..9bc10177a 100644
--- a/src/core/thread/mesh_forwarder.cpp
+++ b/src/core/thread/mesh_forwarder.cpp
@@ -729,11 +729,6 @@ ThreadError MeshForwarder::SendMesh(Message &aMessage, Mac::Frame &aFrame)
     aFrame.SetSrcAddr(mMacSource.mShortAddress);
 
     // write payload
-    if (aMessage.GetLength() > aFrame.GetMaxPayloadLength())
-    {
-        fprintf(stderr, "%d %d\n", aMessage.GetLength(), aFrame.GetMaxPayloadLength());
-    }
-
     assert(aMessage.GetLength() <= aFrame.GetMaxPayloadLength());
     aMessage.Read(0, aMessage.GetLength(), aFrame.GetPayload());
     aFrame.SetPayloadLength(aMessage.GetLength());
diff --git a/third_party/mbedtls/mbedcrypto.c b/third_party/mbedtls/mbedcrypto.c
index b617dcedf..5baadb734 100644
--- a/third_party/mbedtls/mbedcrypto.c
+++ b/third_party/mbedtls/mbedcrypto.c
@@ -41,7 +41,7 @@ static unsigned char sMemoryBuf[MBED_MEMORY_BUF_SIZE];
 static mbedtls_aes_context sAesContext;
 static mbedtls_md_context_t sSha256Context;
 
-void mbedInit()
+void mbedInit(void)
 {
     if (sIsInitialized)
     {