diff --git a/programs/hash/hello.c b/programs/hash/hello.c
index 3ef0652..7bb27ad 100644
--- a/programs/hash/hello.c
+++ b/programs/hash/hello.c
@@ -26,30 +26,32 @@
 #endif
 
 #if !defined(MBEDTLS_MD5_C)
-int main( void )
+int main(void)
 {
     mbedtls_printf("MBEDTLS_MD5_C not defined.\n");
-    mbedtls_exit( 0 );
+    mbedtls_exit(0);
 }
 #else
 
 
-int main( void )
+int main(void)
 {
     int i, ret;
     unsigned char digest[16];
     char str[] = "Hello, world!";
 
-    mbedtls_printf( "\n  MD5('%s') = ", str );
+    mbedtls_printf("\n  MD5('%s') = ", str);
 
-    if( ( ret = mbedtls_md5( (unsigned char *) str, 13, digest ) ) != 0 )
-        mbedtls_exit( MBEDTLS_EXIT_FAILURE );
+    if ((ret = mbedtls_md5((unsigned char *) str, 13, digest)) != 0) {
+        mbedtls_exit(MBEDTLS_EXIT_FAILURE);
+    }
 
-    for( i = 0; i < 16; i++ )
-        mbedtls_printf( "%02x", digest[i] );
+    for (i = 0; i < 16; i++) {
+        mbedtls_printf("%02x", digest[i]);
+    }
 
-    mbedtls_printf( "\n\n" );
+    mbedtls_printf("\n\n");
 
-    mbedtls_exit( MBEDTLS_EXIT_SUCCESS );
+    mbedtls_exit(MBEDTLS_EXIT_SUCCESS);
 }
 #endif /* MBEDTLS_MD5_C */