diff --git a/crypto/rand_extra/rand_test.cc b/crypto/rand_extra/rand_test.cc
index 183c4f77..d0a7e40e 100644
--- a/crypto/rand_extra/rand_test.cc
+++ b/crypto/rand_extra/rand_test.cc
@@ -50,7 +50,8 @@ TEST(RandTest, NotObviouslyBroken) {
   EXPECT_NE(Bytes(buf2), Bytes(kZeros));
 }
 
-#if !defined(OPENSSL_WINDOWS) && !defined(BORINGSSL_UNSAFE_DETERMINISTIC_MODE)
+#if !defined(OPENSSL_WINDOWS) && !defined(OPENSSL_IOS) && \
+    !defined(BORINGSSL_UNSAFE_DETERMINISTIC_MODE)
 static bool ForkAndRand(bssl::Span<uint8_t> out) {
   int pipefds[2];
   if (pipe(pipefds) < 0) {
@@ -144,7 +145,8 @@ TEST(RandTest, Fork) {
   EXPECT_NE(Bytes(buf2), Bytes(kZeros));
   EXPECT_NE(Bytes(buf3), Bytes(kZeros));
 }
-#endif  // !OPENSSL_WINDOWS && !BORINGSSL_UNSAFE_DETERMINISTIC_MODE
+#endif  // !OPENSSL_WINDOWS && !OPENSSL_IOS &&
+        // !BORINGSSL_UNSAFE_DETERMINISTIC_MODE
 
 #if defined(OPENSSL_THREADS)
 static void RunConcurrentRands(size_t num_threads) {
diff --git a/include/openssl/base.h b/include/openssl/base.h
index e287de73..c0d7a8c5 100644
--- a/include/openssl/base.h
+++ b/include/openssl/base.h
@@ -120,6 +120,9 @@ extern "C" {
 
 #if defined(__APPLE__)
 #define OPENSSL_APPLE
+#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
+#define OPENSSL_IOS
+#endif
 #endif
 
 #if defined(_WIN32)