diff --git a/Makefile b/Makefile
index fbc151323..e12ecb17b 100644
--- a/Makefile
+++ b/Makefile
@@ -131,7 +131,6 @@ include libc/tinymath/tinymath.mk		# │  You can issue raw system calls
 include libc/str/str.mk				# │
 include third_party/xed/xed.mk			# │
 include third_party/puff/puff.mk		# │
-include third_party/zlib/zlib.mk		# │
 include libc/elf/elf.mk				# │
 include ape/ape.mk				# │
 include libc/fmt/fmt.mk				# │
@@ -147,6 +146,7 @@ include third_party/gdtoa/gdtoa.mk		# ├──DYNAMIC RUNTIME
 include third_party/nsync/mem/mem.mk		# │  You can now use stdio
 include libc/thread/thread.mk			# │  You can finally call malloc()
 include tool/hello/hello.mk			# │
+include third_party/zlib/zlib.mk		# │
 include libc/stdio/stdio.mk			# │
 include libc/time/time.mk			# │
 include net/net.mk				# │
diff --git a/test/libc/calls/mkdir_test.c b/test/libc/calls/mkdir_test.c
index 6f9b4015a..8ab1bd86f 100644
--- a/test/libc/calls/mkdir_test.c
+++ b/test/libc/calls/mkdir_test.c
@@ -26,6 +26,7 @@
 #include "libc/runtime/runtime.h"
 #include "libc/stdio/stdio.h"
 #include "libc/str/str.h"
+#include "libc/sysv/consts/at.h"
 #include "libc/sysv/consts/o.h"
 #include "libc/testlib/testlib.h"
 #include "libc/x/x.h"
@@ -77,10 +78,14 @@ TEST(mkdir, enametoolong) {
   EXPECT_SYS(ENAMETOOLONG, -1, mkdir(s, 0644));
 }
 
-TEST(makedirs, testEmptyString_ENOENT) {
+TEST(mkdir, testEmptyString_ENOENT) {
   EXPECT_SYS(ENOENT, -1, mkdir("", 0755));
 }
 
+TEST(mkdir, slashSlash) {
+  EXPECT_SYS(0, 0, mkdirat(AT_FDCWD, "o//", 0777));
+}
+
 TEST(mkdirat, testRelativePath_opensRelativeToDirFd) {
   int dirfd;
   ASSERT_SYS(0, 0, mkdir("foo", 0755));
diff --git a/third_party/zlib/zlib.mk b/third_party/zlib/zlib.mk
index c6e19c1b3..1fbfb6c69 100644
--- a/third_party/zlib/zlib.mk
+++ b/third_party/zlib/zlib.mk
@@ -19,6 +19,7 @@ THIRD_PARTY_ZLIB_A_CHECKS =				\
 THIRD_PARTY_ZLIB_A_DIRECTDEPS =				\
 	LIBC_INTRIN					\
 	LIBC_NEXGEN32E					\
+	LIBC_MEM					\
 	LIBC_STR					\
 	LIBC_SYSV
 
diff --git a/third_party/zlib/zutil.c b/third_party/zlib/zutil.c
index d6220db6e..98150040a 100644
--- a/third_party/zlib/zutil.c
+++ b/third_party/zlib/zutil.c
@@ -313,11 +313,7 @@ voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
     unsigned size;
 {
     (void)opaque;
-    if (_weaken(malloc)) {
-        return _weaken(malloc)(items * size);
-    } else {
-        return 0;
-    }
+    return malloc(items * size);
 }
 
 void ZLIB_INTERNAL zcfree (opaque, ptr)
@@ -325,9 +321,7 @@ void ZLIB_INTERNAL zcfree (opaque, ptr)
     voidpf ptr;
 {
     (void)opaque;
-    if (_weaken(free)) {
-        _weaken(free)(ptr);
-    }
+    free(ptr);
 }
 
 #endif /* MY_ZCALLOC */