diff --git a/compiler/utils/arena_allocator.cc b/compiler/utils/arena_allocator.cc
index ca4635d..6a39641 100644
--- a/compiler/utils/arena_allocator.cc
+++ b/compiler/utils/arena_allocator.cc
@@ -215,7 +215,7 @@
 }
 
 void* ArenaAllocator::AllocValgrind(size_t bytes, ArenaAllocKind kind) {
-  size_t rounded_bytes = (bytes + 3 + kValgrindRedZoneBytes) & ~3;
+  size_t rounded_bytes = RoundUp(bytes + kValgrindRedZoneBytes, 8);
   if (UNLIKELY(ptr_ + rounded_bytes > end_)) {
     // Obtain a new block.
     ObtainNewArenaForAllocation(rounded_bytes);
diff --git a/compiler/utils/arena_allocator.h b/compiler/utils/arena_allocator.h
index dbe482d..ac3938f 100644
--- a/compiler/utils/arena_allocator.h
+++ b/compiler/utils/arena_allocator.h
@@ -156,7 +156,7 @@
     if (UNLIKELY(running_on_valgrind_)) {
       return AllocValgrind(bytes, kind);
     }
-    bytes = RoundUp(bytes, 4);
+    bytes = RoundUp(bytes, 8);
     if (UNLIKELY(ptr_ + bytes > end_)) {
       // Obtain a new block.
       ObtainNewArenaForAllocation(bytes);
diff --git a/compiler/utils/scoped_arena_allocator.cc b/compiler/utils/scoped_arena_allocator.cc
index b8b0e6e..aeb2f76 100644
--- a/compiler/utils/scoped_arena_allocator.cc
+++ b/compiler/utils/scoped_arena_allocator.cc
@@ -92,7 +92,7 @@
 }
 
 void* ArenaStack::AllocValgrind(size_t bytes, ArenaAllocKind kind) {
-  size_t rounded_bytes = RoundUp(bytes + kValgrindRedZoneBytes, 4);
+  size_t rounded_bytes = RoundUp(bytes + kValgrindRedZoneBytes, 8);
   uint8_t* ptr = top_ptr_;
   if (UNLIKELY(static_cast<size_t>(top_end_ - ptr) < rounded_bytes)) {
     ptr = AllocateFromNextArena(rounded_bytes);
diff --git a/compiler/utils/scoped_arena_allocator.h b/compiler/utils/scoped_arena_allocator.h
index c090062..37799cb 100644
--- a/compiler/utils/scoped_arena_allocator.h
+++ b/compiler/utils/scoped_arena_allocator.h
@@ -67,7 +67,7 @@
     if (UNLIKELY(running_on_valgrind_)) {
       return AllocValgrind(bytes, kind);
     }
-    size_t rounded_bytes = RoundUp(bytes, 4);
+    size_t rounded_bytes = RoundUp(bytes, 8);
     uint8_t* ptr = top_ptr_;
     if (UNLIKELY(static_cast<size_t>(top_end_ - ptr) < rounded_bytes)) {
       ptr = AllocateFromNextArena(rounded_bytes);