diff --git a/Source/WTF/wtf/PageBlock.h b/Source/WTF/wtf/PageBlock.h

index 33d9118d..3e99decf 100644

--- a/Source/WTF/wtf/PageBlock.h

+++ b/Source/WTF/wtf/PageBlock.h

@@ -49,9 +49,9 @@ namespace WTF {

 // Use 64 KiB for any unknown CPUs to be conservative.

 #if OS(DARWIN)

 constexpr size_t CeilingOnPageSize = 16 * KB;

-#elif OS(WINDOWS) || CPU(MIPS) || CPU(MIPS64) || CPU(X86) || CPU(X86_64) || CPU(ARM) || CPU(ARM64)

+#elif OS(WINDOWS) || CPU(MIPS) || CPU(MIPS64) || CPU(X86) || CPU(X86_64) || CPU(ARM)

 constexpr size_t CeilingOnPageSize = 4 * KB;

-#elif CPU(UNKNOWN) || CPU(PPC) || CPU(PPC64) || CPU(PPC64LE)

+#elif CPU(UNKNOWN) || CPU(PPC) || CPU(PPC64) || CPU(PPC64LE) || CPU(ARM64)

 constexpr size_t CeilingOnPageSize = 64 * KB;

 #else

 #error Must set CeilingOnPageSize in PageBlock.h when adding a new CPU architecture!