diff --git a/doc/obsolete-stuff b/doc/obsolete-stuff
index 37661a6c..028fdbe7 100644
--- a/doc/obsolete-stuff
+++ b/doc/obsolete-stuff
@@ -145,6 +145,15 @@ F_SETLKW) do and should be avoided for the same reasons (see above).
 Use the flock (not to be confused with lockf) call instead as it works at a file
 descriptor level.
 
+mktemp
+------
+
+mktemp(3) (not the mktemp(1) utility) creates a unique path name, but creates no
+file, and thus offers no guarantee that is unique with respect to other threads
+and system processes. The function is racy and dangerous.
+
+Use mkstemp(3) (or for directories mkdtemp(3)) instead.
+
 PATH_MAX
 --------
 
diff --git a/libc/Makefile b/libc/Makefile
index 5862f749..9b76436a 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -455,7 +455,6 @@ stdlib/mkostemp.o \
 stdlib/mkostemps.o \
 stdlib/mkstemp.o \
 stdlib/mkstemps.o \
-stdlib/mktemp.o \
 stdlib/on_exit.o \
 stdlib/rand.o \
 stdlib/realpath.o \
diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index 183ce1c8..4cde309f 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -110,10 +110,6 @@ int mkostemp(char*, int);
 int mkostemps(char*, int, int);
 int mkstemp(char*);
 int mkstemps(char*, int);
-#if !defined(__is_sortix_libc) /* not a warning inside libc */
-__attribute__((__warning__("mktemp() is racy, use mkstemp()")))
-#endif
-char* mktemp(char* templ);
 int on_exit(void (*function)(int, void*), void* arg);
 void qsort(void*, size_t, size_t, int (*)(const void*, const void*));
 void qsort_r(void*, size_t, size_t, int (*)(const void*, const void*, void*), void*);
diff --git a/libc/stdlib/mktemp.cpp b/libc/stdlib/mktemp.cpp
deleted file mode 100644
index 6b5b4d62..00000000
--- a/libc/stdlib/mktemp.cpp
+++ /dev/null
@@ -1,37 +0,0 @@
-/*******************************************************************************
-
-    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
-
-    This file is part of the Sortix C Library.
-
-    The Sortix C Library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU Lesser General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or (at your
-    option) any later version.
-
-    The Sortix C Library is distributed in the hope that it will be useful, but
-    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
-    License for more details.
-
-    You should have received a copy of the GNU Lesser General Public License
-    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
-
-    stdlib/mktemp.cpp
-    Make a unique temporary filename.
-
-*******************************************************************************/
-
-#include <stdlib.h>
-#include <string.h>
-
-// TODO: This is a hacky implementation of a stupid function.
-extern "C" char* mktemp(char* templ)
-{
-	size_t templlen = strlen(templ);
-	for ( size_t i = templlen-6UL; i < templlen; i++ )
-	{
-		templ[i] = '0' + rand() % 10;
-	}
-	return templ;
-}