diff --git a/Makefile.mak b/Makefile.mak
index 527335660..8b80045a4 100644
--- a/Makefile.mak
+++ b/Makefile.mak
@@ -231,10 +231,12 @@ ifeq ($(OPTION_MCU),disable)
  
  ifeq ($(OPTION_MUSL),enable)
   CC := musl-$(CC) 
+  DEFINES_JERRY += -DLIBC_MUSL
   CFLAGS_COMMON += -static
  else
   CFLAGS_COMMON += -fsanitize=address
  endif
+
  ifeq ($(OPTION_COLOR),enable)
   CFLAGS_COMMON += -fdiagnostics-color=always
  endif
diff --git a/src/libruntime/jerry-libc.c b/src/libruntime/jerry-libc.c
index b03d133f9..f3b82f0ea 100644
--- a/src/libruntime/jerry-libc.c
+++ b/src/libruntime/jerry-libc.c
@@ -18,36 +18,40 @@
  */
 
 #include "jerry-libc.h"
-//
-///**
-// * memcpy alias to __memcpy (for compiler usage)
-// */
-//extern void *memcpy(void *s1, const void*s2, size_t n);
-//
-///**
-// * memset alias to __memset (for compiler usage)
-// */
-//extern void *memset(void *s, int c, size_t n);
-//
-///**
-// * memcpy alias to __memcpy (for compiler usage)
-// */
-//void* memcpy(void *s1, /**< destination */
-//             const void* s2, /**< source */
-//             size_t n) /**< bytes number */
-//{
-//  return __memcpy(s1, s2, n);
-//} /* memcpy */
-//
-///**
-// * memset alias to __memset (for compiler usage)
-// */
-//void* memset(void *s,  /**< area to set values in */
-//             int c,    /**< value to set */
-//             size_t n) /**< area size */
-//{
-//  return __memset(s, c, n);
-//} /* memset */
+
+FIXME( #ifndef LIBC_MUSL should be removed from here when own libc will be implemented )
+
+#ifndef LIBC_MUSL
+/**
+ * memcpy alias to __memcpy (for compiler usage)
+ */
+extern void *memcpy(void *s1, const void*s2, size_t n);
+
+/**
+ * memset alias to __memset (for compiler usage)
+ */
+extern void *memset(void *s, int c, size_t n);
+
+/**
+ * memcpy alias to __memcpy (for compiler usage)
+ */
+void* memcpy(void *s1, /**< destination */
+             const void* s2, /**< source */
+             size_t n) /**< bytes number */
+{
+  return __memcpy(s1, s2, n);
+} /* memcpy */
+
+/**
+ * memset alias to __memset (for compiler usage)
+ */
+void* memset(void *s,  /**< area to set values in */
+             int c,    /**< value to set */
+             size_t n) /**< area size */
+{
+  return __memset(s, c, n);
+} /* memset */
+#endif /* LIBC_MUSL */
 
 /**
  * memset