diff --git a/libc/include/sys/random.h b/libc/include/sys/random.h
index be52bd9..0251176 100644
--- a/libc/include/sys/random.h
+++ b/libc/include/sys/random.h
@@ -50,7 +50,7 @@
  *
  * See also arc4random_buf() which is available in all API levels.
  */
-int getentropy(void* __buffer, size_t __buffer_size) __wur __INTRODUCED_IN(28);
+int getentropy(void* _Nonnull __buffer, size_t __buffer_size) __wur __INTRODUCED_IN(28);
 
 /**
  * [getrandom(2)](http://man7.org/linux/man-pages/man2/getrandom.2.html) fills the given buffer
@@ -62,6 +62,6 @@
  *
  * See also arc4random_buf() which is available in all API levels.
  */
-ssize_t getrandom(void* __buffer, size_t __buffer_size, unsigned int __flags) __wur __INTRODUCED_IN(28);
+ssize_t getrandom(void* _Nonnull __buffer, size_t __buffer_size, unsigned int __flags) __wur __INTRODUCED_IN(28);
 
 __END_DECLS
diff --git a/tests/sys_random_test.cpp b/tests/sys_random_test.cpp
index 2e2665b..e0cbf78 100644
--- a/tests/sys_random_test.cpp
+++ b/tests/sys_random_test.cpp
@@ -48,6 +48,8 @@
 }
 
 TEST(sys_random, getentropy_EFAULT) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wnonnull"
 #if defined(HAVE_SYS_RANDOM)
   errno = 0;
   ASSERT_EQ(-1, getentropy(nullptr, 1));
@@ -55,6 +57,7 @@
 #else
   GTEST_SKIP() << "<sys/random.h> not available";
 #endif
+#pragma clang diagnostic pop
 }
 
 TEST(sys_random, getentropy_EIO) {
@@ -84,6 +87,8 @@
 }
 
 TEST(sys_random, getrandom_EFAULT) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wnonnull"
 #if defined(HAVE_SYS_RANDOM)
   errno = 0;
   ASSERT_EQ(-1, getrandom(nullptr, 256, 0));
@@ -91,6 +96,7 @@
 #else
   GTEST_SKIP() << "<sys/random.h> not available";
 #endif
+#pragma clang diagnostic pop
 }
 
 TEST(sys_random, getrandom_EINVAL) {