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

index 8ff8443d0e25..f37666d35bf2 100644

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

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

@@ -46,9 +46,9 @@ namespace WTF {

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

 #if OS(DARWIN) || PLATFORM(PLAYSTATION) || CPU(MIPS) || CPU(MIPS64)

 constexpr size_t CeilingOnPageSize = 16 * KB;

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

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

 constexpr size_t CeilingOnPageSize = 64 * KB;

-#elif OS(WINDOWS) || CPU(X86) || CPU(X86_64) || CPU(ARM) || CPU(ARM64) || CPU(RISCV64)

+#elif OS(WINDOWS) || CPU(X86) || CPU(X86_64) || CPU(ARM) || CPU(RISCV64)

 constexpr size_t CeilingOnPageSize = 4 * KB;

 #else

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