3 files changed, 6 insertions, 4 deletions
diff --git a/libc/stdlib/malloc/heap_debug.c b/libc/stdlib/malloc/heap_debug.c
index 4804ba9ee..7dab95627 100644
--- a/libc/stdlib/malloc/heap_debug.c
+++ b/libc/stdlib/malloc/heap_debug.c
@@ -80,13 +80,13 @@ __heap_check_failure (struct heap *heap, struct heap_free_area *fa,
   vfprintf (stderr, fmt, val);
   va_end (val);
 
-  putc ('\n', stderr);
+  __putc ('\n', stderr);
 
   __malloc_debug_set_indent (0);
   __malloc_debug_printf (1, "heap dump:");
   __heap_dump_freelist (heap);
 
-  exit (22);
+  __exit (22);
 }
 
 /* Do some consistency checks on HEAP.  If they fail, output an error
diff --git a/libc/stdlib/malloc/malloc.h b/libc/stdlib/malloc/malloc.h
index 08ebfdf5b..707cad13d 100644
--- a/libc/stdlib/malloc/malloc.h
+++ b/libc/stdlib/malloc/malloc.h
@@ -79,6 +79,8 @@ extern struct heap __malloc_mmb_heap;
    to stderr, when the variable __malloc_mmb_debug is set to true. */
 #ifdef MALLOC_MMB_DEBUGGING
 # include <stdio.h>
+extern int __putc(int c, FILE *stream) attribute_hidden;
+
 extern int __malloc_mmb_debug;
 # define MALLOC_MMB_DEBUG(indent, fmt, args...)				      \
    (__malloc_mmb_debug ? __malloc_debug_printf (indent, fmt , ##args) : 0)
diff --git a/libc/stdlib/malloc/malloc_debug.c b/libc/stdlib/malloc/malloc_debug.c
index e8711ff77..abe5546ca 100644
--- a/libc/stdlib/malloc/malloc_debug.c
+++ b/libc/stdlib/malloc/malloc_debug.c
@@ -42,7 +42,7 @@ __malloc_debug_printf (int indent, const char *fmt, ...)
 
   while (spaces > 0)
     {
-      putc (' ', stderr);
+      __putc (' ', stderr);
       spaces--;
     }
 
@@ -50,7 +50,7 @@ __malloc_debug_printf (int indent, const char *fmt, ...)
   vfprintf (stderr, fmt, val);
   va_end (val);
 
-  putc ('\n', stderr);
+  __putc ('\n', stderr);
 
   __malloc_debug_indent (indent);
 }