diff --git a/include/stdlib.h b/include/stdlib.h
index 8dd0dd5..cab010d 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -7,25 +7,25 @@
 /* Dynamic memory management. */
 
 /* Allocate SIZE bytes of memory. */
-extern void *malloc(size_t size);
+extern void *malloc(size_t __size);
 
 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */
-extern void *calloc(size_t nmemb, size_t size);
+extern void *calloc(size_t __nmemb, size_t __size);
 
 /*
 ** Re-allocate the previously allocated block in PTR, making the new block
 ** SIZE bytes long.
 */
-extern void *realloc(void *ptr, size_t size);
+extern void *realloc(void *__ptr, size_t __size);
 
 /*
 ** Re-allocate the previously allocated block in PTR, making the new block large
 ** enough for NMEMB elements of SIZE bytes each.
 */
-extern void *reallocarray(void *ptr, size_t nmemb, size_t size);
+extern void *reallocarray(void *__ptr, size_t __nmemb, size_t __size);
 
 /* Free a block allocated by `malloc', `realloc' or `calloc'. */
-extern void free(void *ptr);
+extern void free(void *__ptr);
 
 /* Integer arithmetic functions. */