diff --git a/library/alignment.h b/library/alignment.h
index dedfdc9..e7f11da 100644
--- a/library/alignment.h
+++ b/library/alignment.h
@@ -33,10 +33,10 @@
  * \param   p pointer to 4 bytes of data
  * \return  Data at the given address
  */
-inline uint32_t mbedtls_get_unaligned_uint32( void const *p )
+inline uint32_t mbedtls_get_unaligned_uint32( const void *p )
 {
     uint32_t r;
-    memcpy( &r, p, 4 );
+    memcpy( &r, p, sizeof( r ) );
     return r;
 }
 
@@ -49,7 +49,7 @@
  */
 inline void mbedtls_put_unaligned_uint32( void *p, uint32_t x )
 {
-    memcpy( p, &x, 4 );
+    memcpy( p, &x, sizeof( x ) );
 }
 
 /** Byte Reading Macros
diff --git a/library/common.h b/library/common.h
index c175064..2cc44fb 100644
--- a/library/common.h
+++ b/library/common.h
@@ -86,7 +86,7 @@
  * \param   b Pointer to input (buffer of at least \p n bytes)
  * \param   n Number of bytes to process.
  */
-inline void mbedtls_xor( unsigned char *r, unsigned char const *a, unsigned char const *b, size_t n )
+inline void mbedtls_xor( unsigned char *r, const unsigned char *a, const unsigned char *b, size_t n )
 {
     size_t i;
     for ( i = 0; ( i + 4 ) <= n; i += 4 )
diff --git a/tests/suites/test_suite_common.function b/tests/suites/test_suite_common.function
index c8a7a52..4444a52 100644
--- a/tests/suites/test_suite_common.function
+++ b/tests/suites/test_suite_common.function
@@ -82,9 +82,9 @@
         ASSERT_COMPARE( r1 + r_off, n, r2 + r_off, n );
     }
 exit:
-    if ( a != NULL ) mbedtls_free( a );
-    if ( a != NULL ) mbedtls_free( b );
-    if ( r1 != NULL ) mbedtls_free( r1 );
-    if ( r2 != NULL ) mbedtls_free( r2 );
+    mbedtls_free( a );
+    mbedtls_free( b );
+    mbedtls_free( r1 );
+    mbedtls_free( r2 );
 }
 /* END_CASE */