diff --git a/third_party/subzero/src/IceTargetLoweringX8632.h b/third_party/subzero/src/IceTargetLoweringX8632.h
index a012d17..8272ebe 100644
--- a/third_party/subzero/src/IceTargetLoweringX8632.h
+++ b/third_party/subzero/src/IceTargetLoweringX8632.h
@@ -874,7 +874,7 @@
   void findRMW();
 
   bool IsEbpBasedFrame = false;
-  size_t RequiredStackAlignment = sizeof(Traits::WordType);
+  size_t RequiredStackAlignment = sizeof(int32_t); // 4 bytes
   size_t SpillAreaSizeBytes = 0;
   size_t FixedAllocaSizeBytes = 0;
   size_t FixedAllocaAlignBytes = 0;
diff --git a/third_party/subzero/src/IceTargetLoweringX8664.h b/third_party/subzero/src/IceTargetLoweringX8664.h
index 738ddae..78074d2 100644
--- a/third_party/subzero/src/IceTargetLoweringX8664.h
+++ b/third_party/subzero/src/IceTargetLoweringX8664.h
@@ -868,7 +868,7 @@
   void findRMW();
 
   bool IsEbpBasedFrame = false;
-  size_t RequiredStackAlignment = sizeof(Traits::WordType);
+  size_t RequiredStackAlignment = sizeof(int64_t); // 8 bytes
   size_t SpillAreaSizeBytes = 0;
   size_t FixedAllocaSizeBytes = 0;
   size_t FixedAllocaAlignBytes = 0;