diff --git Source/WTF/wtf/RandomDevice.cpp Source/WTF/wtf/RandomDevice.cpp
index 89165f03..99251674 100644
--- Source/WTF/wtf/RandomDevice.cpp
+++ Source/WTF/wtf/RandomDevice.cpp
@@ -30,7 +30,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-#if !OS(DARWIN) && !OS(FUCHSIA) && OS(UNIX)
+#if (1)
 #include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
@@ -41,7 +41,7 @@
 #include <wincrypt.h> // windows.h must be included before wincrypt.h.
 #endif
 
-#if OS(DARWIN)
+#if (0)
 #include <CommonCrypto/CommonCryptoError.h>
 #include <CommonCrypto/CommonRandom.h>
 #endif
@@ -52,7 +52,7 @@
 
 namespace WTF {
 
-#if !OS(DARWIN) && !OS(FUCHSIA) && OS(UNIX)
+#if (1)
 NEVER_INLINE NO_RETURN_DUE_TO_CRASH static void crashUnableToOpenURandom()
 {
     CRASH();
@@ -64,7 +64,7 @@ NEVER_INLINE NO_RETURN_DUE_TO_CRASH static void crashUnableToReadFromURandom()
 }
 #endif
 
-#if !OS(DARWIN) && !OS(FUCHSIA) && !OS(WINDOWS)
+#if (1)
 RandomDevice::RandomDevice()
 {
     int ret = 0;
@@ -77,7 +77,7 @@ RandomDevice::RandomDevice()
 }
 #endif
 
-#if !OS(DARWIN) && !OS(FUCHSIA) && !OS(WINDOWS)
+#if (1)
 RandomDevice::~RandomDevice()
 {
     close(m_fd);
@@ -88,11 +88,11 @@ RandomDevice::~RandomDevice()
 // https://bugs.webkit.org/show_bug.cgi?id=170190
 void RandomDevice::cryptographicallyRandomValues(unsigned char* buffer, size_t length)
 {
-#if OS(DARWIN)
+#if (0)
     RELEASE_ASSERT(!CCRandomGenerateBytes(buffer, length));
 #elif OS(FUCHSIA)
     zx_cprng_draw(buffer, length);
-#elif OS(UNIX)
+#elif (1)
     ssize_t amountRead = 0;
     while (static_cast<size_t>(amountRead) < length) {
         ssize_t currentRead = read(m_fd, buffer + amountRead, length - amountRead);
diff --git Source/WTF/wtf/RandomDevice.h Source/WTF/wtf/RandomDevice.h
index 411bde3e..9c9c6da8 100644
--- Source/WTF/wtf/RandomDevice.h
+++ Source/WTF/wtf/RandomDevice.h
@@ -35,7 +35,7 @@ class RandomDevice {
     WTF_MAKE_NONCOPYABLE(RandomDevice);
     WTF_MAKE_FAST_ALLOCATED;
 public:
-#if OS(DARWIN) || OS(FUCHSIA) || OS(WINDOWS)
+#if (0)
     RandomDevice() = default;
 #else
     RandomDevice();
@@ -48,8 +48,8 @@ public:
     void cryptographicallyRandomValues(unsigned char* buffer, size_t length);
 
 private:
-#if OS(DARWIN) || OS(FUCHSIA) || OS(WINDOWS)
-#elif OS(UNIX)
+#if (0)
+#elif (1)
     int m_fd { -1 };
 #else
 #error "This configuration doesn't have a strong source of randomness."