diff --git a/src/liballocator/mem-heap.c b/src/liballocator/mem-heap.c
index 56dadd17c..747ee85dc 100644
--- a/src/liballocator/mem-heap.c
+++ b/src/liballocator/mem-heap.c
@@ -35,12 +35,12 @@
 #ifndef JERRY_NVALGRIND
 # include "memcheck.h"
 
-# define VALGRIND_NOACCESS_STRUCT( s)    VALGRIND_MAKE_MEM_NOACCESS( ( s ), sizeof( *( s ) ) )
-# define VALGRIND_UNDEFINED_STRUCT( s)   VALGRIND_MAKE_MEM_UNDEFINED( ( s ), sizeof( *( s ) ) )
-# define VALGRIND_DEFINED_STRUCT( s)     VALGRIND_MAKE_MEM_DEFINED( ( s ), sizeof( *( s ) ) )
-# define VALGRIND_NOACCESS_SPACE( p, s)  VALGRIND_MAKE_MEM_NOACCESS( ( p ), ( s ) )
-# define VALGRIND_UNDEFINED_SPACE( p, s) VALGRIND_MAKE_MEM_UNDEFINED( ( p ), ( s ) )
-# define VALGRIND_DEFINED_SPACET( p, s)  VALGRIND_MAKE_MEM_DEFINED( ( p ), ( s ) )
+# define VALGRIND_NOACCESS_STRUCT( s)    (void)VALGRIND_MAKE_MEM_NOACCESS( ( s ), sizeof( *( s ) ) )
+# define VALGRIND_UNDEFINED_STRUCT( s)   (void)VALGRIND_MAKE_MEM_UNDEFINED( ( s ), sizeof( *( s ) ) )
+# define VALGRIND_DEFINED_STRUCT( s)     (void)VALGRIND_MAKE_MEM_DEFINED( ( s ), sizeof( *( s ) ) )
+# define VALGRIND_NOACCESS_SPACE( p, s)  (void)VALGRIND_MAKE_MEM_NOACCESS( ( p ), ( s ) )
+# define VALGRIND_UNDEFINED_SPACE( p, s) (void)VALGRIND_MAKE_MEM_UNDEFINED( ( p ), ( s ) )
+# define VALGRIND_DEFINED_SPACET( p, s)  (void)VALGRIND_MAKE_MEM_DEFINED( ( p ), ( s ) )
 #else /* !JERRRY_NVALGRIND */
 # define VALGRIND_NOACCESS_STRUCT( s)
 # define VALGRIND_UNDEFINED_STRUCT( s)
diff --git a/src/libruntime/target/linux/jerry-libc.c b/src/libruntime/target/linux/jerry-libc.c
index c7ee6ecfa..798e96dbc 100644
--- a/src/libruntime/target/linux/jerry-libc.c
+++ b/src/libruntime/target/linux/jerry-libc.c
@@ -351,12 +351,11 @@ __fwrite(const void *ptr, /**< data to write */
          size_t nmemb, /**< number of elements */
          _FILE *stream) /**< stream pointer */
 {
-  long int ret;
   size_t bytes_written = 0;
 
   do
     {
-      ret = syscall_3( __NR_write, (long int)stream, (long int) ((uint8_t*)ptr + bytes_written), (long int) (size * nmemb - bytes_written));
+      long int ret = syscall_3( __NR_write, (long int)stream, (long int) ((uint8_t*)ptr + bytes_written), (long int) (size * nmemb - bytes_written));
 
       bytes_written += (size_t)ret;
     } while (bytes_written != size * nmemb);