diff --git a/features/nanostack/coap-service/source/coap_security_handler.c b/features/nanostack/coap-service/source/coap_security_handler.c
index b2ec1b69d5..5afd2abf02 100644
--- a/features/nanostack/coap-service/source/coap_security_handler.c
+++ b/features/nanostack/coap-service/source/coap_security_handler.c
@@ -155,8 +155,8 @@ static int coap_security_handler_init(coap_security_t *sec)
 #elif defined(MBEDTLS_HMAC_DRBG_C)
     if ((mbedtls_hmac_drbg_seed(&sec->_drbg, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
                                 mbedtls_entropy_func, &sec->_entropy,
-                               (const unsigned char *) pers,
-                               strlen(pers))) != 0) {
+                                (const unsigned char *) pers,
+                                strlen(pers))) != 0) {
         return -1;
     }
 #else
diff --git a/features/nanostack/coap-service/test/coap-service/unittest/stub/mbedtls_stub.c b/features/nanostack/coap-service/test/coap-service/unittest/stub/mbedtls_stub.c
index de419181a7..403ae9a57a 100644
--- a/features/nanostack/coap-service/test/coap-service/unittest/stub/mbedtls_stub.c
+++ b/features/nanostack/coap-service/test/coap-service/unittest/stub/mbedtls_stub.c
@@ -249,33 +249,33 @@ int mbedtls_ctr_drbg_random(void *p_rng,
 }
 
 // from hmac_drbg.h
-void mbedtls_hmac_drbg_init( mbedtls_hmac_drbg_context *ctx )
+void mbedtls_hmac_drbg_init(mbedtls_hmac_drbg_context *ctx)
 {
 
 }
 
-void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx )
+void mbedtls_hmac_drbg_free(mbedtls_hmac_drbg_context *ctx)
 {
 
 }
 
-int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
-                            const mbedtls_md_info_t * md_info,
-                            int (*f_entropy)(void *, unsigned char *, size_t),
-                            void *p_entropy,
-                            const unsigned char *custom,
-                            size_t len )
+int mbedtls_hmac_drbg_seed(mbedtls_hmac_drbg_context *ctx,
+                           const mbedtls_md_info_t *md_info,
+                           int (*f_entropy)(void *, unsigned char *, size_t),
+                           void *p_entropy,
+                           const unsigned char *custom,
+                           size_t len)
 {
     return mbedtls_stub.crt_expected_int;
 }
 
-int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len )
+int mbedtls_hmac_drbg_random(void *p_rng, unsigned char *output, size_t out_len)
 {
     return mbedtls_stub.crt_expected_int;
 }
 
 // from md.h
-const mbedtls_md_info_t *mbedtls_md_info_from_type( mbedtls_md_type_t md_type )
+const mbedtls_md_info_t *mbedtls_md_info_from_type(mbedtls_md_type_t md_type)
 {
     return 0;
 }