diff --git a/AK/Memory.h b/AK/Memory.h
index 2eda4834146..45d148f74d5 100644
--- a/AK/Memory.h
+++ b/AK/Memory.h
@@ -17,16 +17,26 @@
 
 ALWAYS_INLINE void fast_u32_copy(u32* dest, const u32* src, size_t count)
 {
+#if ARCH(I386)
     asm volatile(
         "rep movsl\n"
         : "+S"(src), "+D"(dest), "+c"(count)::"memory");
+#else
+    __builtin_memcpy(dest, src, count * 4);
+#endif
 }
 
 ALWAYS_INLINE void fast_u32_fill(u32* dest, u32 value, size_t count)
 {
+#if ARCH(I386)
     asm volatile(
         "rep stosl\n"
         : "=D"(dest), "=c"(count)
         : "D"(dest), "c"(count), "a"(value)
         : "memory");
+#else
+    for (auto* p = dest; p < (dest + count); ++p) {
+        *p = value;
+    }
+#endif
 }