diff --git a/newlib/libc/include/malloc.h b/newlib/libc/include/malloc.h
index e12a13244..a9dc5bca6 100644
--- a/newlib/libc/include/malloc.h
+++ b/newlib/libc/include/malloc.h
@@ -133,6 +133,10 @@ extern int malloc_trim (size_t);
 extern int _malloc_trim_r (struct _reent *, size_t);
 #endif
 
+extern void __malloc_lock(struct _reent *);
+
+extern void __malloc_unlock(struct _reent *);
+
 /* A compatibility routine for an earlier version of the allocator.  */
 
 extern void mstats (char *);
diff --git a/newlib/libc/stdlib/nano-mallocr.c b/newlib/libc/stdlib/nano-mallocr.c
index a0accdd36..13b72c99f 100644
--- a/newlib/libc/stdlib/nano-mallocr.c
+++ b/newlib/libc/stdlib/nano-mallocr.c
@@ -35,6 +35,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
+#include <malloc.h>
 
 #if DEBUG
 #include <assert.h>
@@ -150,20 +151,6 @@ typedef struct malloc_chunk
     struct malloc_chunk * next;
 }chunk;
 
-/* Copied from malloc.h */
-struct mallinfo
-{
-  size_t arena;    /* total space allocated from system */
-  size_t ordblks;  /* number of non-inuse chunks */
-  size_t smblks;   /* unused -- always zero */
-  size_t hblks;    /* number of mmapped regions */
-  size_t hblkhd;   /* total space in mmapped regions */
-  size_t usmblks;  /* unused -- always zero */
-  size_t fsmblks;  /* unused -- always zero */
-  size_t uordblks; /* total allocated space */
-  size_t fordblks; /* total non-inuse space */
-  size_t keepcost; /* top-most, releasable (via malloc_trim) space */
-};
 
 #define CHUNK_OFFSET ((malloc_size_t)(&(((struct malloc_chunk *)0)->next)))
 
@@ -181,7 +168,6 @@ extern void * nano_malloc(RARG malloc_size_t);
 extern void nano_free (RARG void * free_p);
 extern void nano_cfree(RARG void * ptr);
 extern void * nano_calloc(RARG malloc_size_t n, malloc_size_t elem);
-extern struct mallinfo nano_mallinfo(RONEARG);
 extern void nano_malloc_stats(RONEARG);
 extern malloc_size_t nano_malloc_usable_size(RARG void * ptr);
 extern void * nano_realloc(RARG void * ptr, malloc_size_t size);