diff --git a/libc/Android.bp b/libc/Android.bp
index 9dcd180..ae07c6b 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -269,6 +269,7 @@
         "-Wno-unused-parameter",
         "-include netbsd-compat.h",
         "-Wframe-larger-than=66000",
+        "-include private/bsd_sys_param.h",
     ],
 
     local_include_dirs: [
@@ -579,6 +580,7 @@
     ],
 
     local_include_dirs: [
+        "private",
         "upstream-openbsd/android/include/",
         "upstream-openbsd/lib/libc/include/",
         "upstream-openbsd/lib/libc/gdtoa/",
diff --git a/libc/bionic/fts.c b/libc/bionic/fts.c
index 34de992..77b4117 100644
--- a/libc/bionic/fts.c
+++ b/libc/bionic/fts.c
@@ -54,10 +54,9 @@
 static u_short	 fts_stat(FTS *, FTSENT *, int, int);
 static int	 fts_safe_changedir(FTS *, FTSENT *, int, const char *);
 
+/* Android: OpenBSD source compatibility workarounds. */
+#include "private/bsd_sys_param.h"
 #define DEF_WEAK(s) /* nothing */
-#define ALIGNBYTES (sizeof(uintptr_t) - 1)
-#define ALIGN(p) (((uintptr_t)(p) + ALIGNBYTES) &~ ALIGNBYTES)
-void* reallocarray(void*, size_t, size_t);
 void* recallocarray(void*, size_t, size_t, size_t);
 
 #define	ISDOT(a)	(a[0] == '.' && (!a[1] || (a[1] == '.' && !a[2])))
diff --git a/libc/dns/net/gethnamaddr.c b/libc/dns/net/gethnamaddr.c
index 84942f8..f8212a2 100644
--- a/libc/dns/net/gethnamaddr.c
+++ b/libc/dns/net/gethnamaddr.c
@@ -75,9 +75,6 @@
 #include <syslog.h>
 #include <unistd.h>
 
-#define ALIGNBYTES (sizeof(uintptr_t) - 1)
-#define ALIGN(p) (((uintptr_t)(p) + ALIGNBYTES) &~ ALIGNBYTES)
-
 #ifndef LOG_AUTH
 # define LOG_AUTH 0
 #endif
diff --git a/libc/dns/net/sethostent.c b/libc/dns/net/sethostent.c
index a743a54..b2b0132 100644
--- a/libc/dns/net/sethostent.c
+++ b/libc/dns/net/sethostent.c
@@ -55,9 +55,6 @@
 #include "hostent.h"
 #include "resolv_private.h"
 
-#define ALIGNBYTES (sizeof(uintptr_t) - 1)
-#define ALIGN(p) (((uintptr_t)(p) + ALIGNBYTES) &~ ALIGNBYTES)
-
 #ifndef _REENTRANT
 void	res_close(void);
 #endif
diff --git a/libc/private/bsd_sys_param.h b/libc/private/bsd_sys_param.h
new file mode 100644
index 0000000..8c936c4
--- /dev/null
+++ b/libc/private/bsd_sys_param.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+/* OpenBSD has these in <sys/param.h>, but "ALIGN" isn't something we want to reserve. */
+#define ALIGNBYTES (sizeof(uintptr_t) - 1)
+#define ALIGN(p) (((uintptr_t)(p) + ALIGNBYTES) & ~ALIGNBYTES)
diff --git a/libc/stdio/stdio.cpp b/libc/stdio/stdio.cpp
index b8aced8..c7b1ba4 100644
--- a/libc/stdio/stdio.cpp
+++ b/libc/stdio/stdio.cpp
@@ -57,8 +57,7 @@
 #include "private/ErrnoRestorer.h"
 #include "private/thread_private.h"
 
-#define ALIGNBYTES (sizeof(uintptr_t) - 1)
-#define ALIGN(p) (((uintptr_t)(p) + ALIGNBYTES) &~ ALIGNBYTES)
+#include "private/bsd_sys_param.h" // For ALIGN/ALIGNBYTES.
 
 #define	NDYNAMIC 10		/* add ten more whenever necessary */
 
diff --git a/libc/upstream-openbsd/android/include/openbsd-compat.h b/libc/upstream-openbsd/android/include/openbsd-compat.h
index 2fc5046..6c21c5b 100644
--- a/libc/upstream-openbsd/android/include/openbsd-compat.h
+++ b/libc/upstream-openbsd/android/include/openbsd-compat.h
@@ -25,6 +25,8 @@
 
 #include <sys/random.h> // For getentropy.
 
+#include "private/bsd_sys_param.h"
+
 #define __BEGIN_HIDDEN_DECLS _Pragma("GCC visibility push(hidden)")
 #define __END_HIDDEN_DECLS _Pragma("GCC visibility pop")
 
@@ -57,10 +59,6 @@
 
 #define explicit_bzero(p, s) memset(p, 0, s)
 
-/* OpenBSD has these in <sys/param.h>, but "ALIGN" isn't something we want to reserve. */
-#define ALIGNBYTES (sizeof(uintptr_t) - 1)
-#define ALIGN(p) (((uintptr_t)(p) + ALIGNBYTES) &~ ALIGNBYTES)
-
 /* OpenBSD has this in paths.h. But this directory doesn't normally exist.
  * Even when it does exist, only the 'shell' user has permissions.
  */