diff --git a/library/bignum.c b/library/bignum.c
index 9776d29..acf620f 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -712,7 +712,7 @@
 int mbedtls_mpi_write_binary_le( const mbedtls_mpi *X,
                                  unsigned char *buf, size_t buflen )
 {
-    return( mbedtls_mpi_core_write_le( X->p, X->n, buf, buflen) );
+    return( mbedtls_mpi_core_write_le( X->p, X->n, buf, buflen ) );
 }
 
 /*
diff --git a/library/bignum_core.c b/library/bignum_core.c
index d3d74ff..41be496 100644
--- a/library/bignum_core.c
+++ b/library/bignum_core.c
@@ -174,7 +174,10 @@
         memset( X, 0, X_limbs * ciL );
 
         for( size_t i = 0; i < input_length; i++ )
-            X[i / ciL] |= ((mbedtls_mpi_uint) input[i]) << ((i % ciL) << 3);
+        {
+            size_t offset = ( ( i % ciL ) << 3 );
+            X[i / ciL] |= ( (mbedtls_mpi_uint) input[i] ) << offset;
+        }
     }
 
     return( 0 );
diff --git a/library/bignum_core.h b/library/bignum_core.h
index 1557d10..221bb1a 100644
--- a/library/bignum_core.h
+++ b/library/bignum_core.h
@@ -141,9 +141,9 @@
                                unsigned char *output,
                                size_t output_length );
 
-#define ciL    (sizeof(mbedtls_mpi_uint))   /* chars in limb  */
-#define biL    (ciL << 3)                   /* bits  in limb  */
-#define biH    (ciL << 2)                   /* half limb size */
+#define ciL    ( sizeof(mbedtls_mpi_uint) )   /* chars in limb  */
+#define biL    ( ciL << 3 )                   /* bits  in limb  */
+#define biH    ( ciL << 2 )                   /* half limb size */
 
 /*
  * Convert between bits/chars and number of limbs
@@ -153,6 +153,6 @@
 #define CHARS_TO_LIMBS(i) ( (i) / ciL + ( (i) % ciL != 0 ) )
 /* Get a specific byte, without range checks. */
 #define GET_BYTE( X, i )                                \
-    ( ( ( X )[( i ) / ciL] >> ( ( ( i ) % ciL ) * 8 ) ) & 0xff )
+    ( ( (X)[(i) / ciL] >> ( ( (i) % ciL ) * 8 ) ) & 0xff )
 
 #endif /* MBEDTLS_BIGNUM_CORE_H */