diff --git a/third_party/llvm-subzero/lib/Support/Host.cpp b/third_party/llvm-subzero/lib/Support/Host.cpp
index dd19eee..52fc297 100644
--- a/third_party/llvm-subzero/lib/Support/Host.cpp
+++ b/third_party/llvm-subzero/lib/Support/Host.cpp
@@ -740,7 +740,7 @@
 static unsigned getAvailableFeatures(unsigned int ECX, unsigned int EDX,
                                      unsigned MaxLeaf) {
   unsigned Features = 0;
-  unsigned int EAX, EBX;
+  unsigned int EAX = 0, EBX = 0;
   Features |= (((EDX >> 23) & 1) << FEATURE_MMX);
   Features |= (((EDX >> 25) & 1) << FEATURE_SSE);
   Features |= (((EDX >> 26) & 1) << FEATURE_SSE2);
@@ -796,8 +796,8 @@
   detectX86FamilyModel(EAX, &Family, &Model);
   Features = getAvailableFeatures(ECX, EDX, MaxLeaf);
 
-  unsigned Type;
-  unsigned Subtype;
+  unsigned Type = 0;
+  unsigned Subtype = 0;
 
   if (Vendor == SIG_INTEL) {
     getIntelProcessorTypeAndSubtype(Family, Model, Brand_id, Features, &Type,
diff --git a/third_party/subzero/src/IceTargetLoweringX86BaseImpl.h b/third_party/subzero/src/IceTargetLoweringX86BaseImpl.h
index dbc0ee2..250ae56 100644
--- a/third_party/subzero/src/IceTargetLoweringX86BaseImpl.h
+++ b/third_party/subzero/src/IceTargetLoweringX86BaseImpl.h
@@ -5300,7 +5300,7 @@
     // reverse order. Then handle any remainder with overlapping copies. Since
     // the remainder will be at the end, there will be reduces pressure on the
     // memory unit as the access to the same memory are far apart.
-    Type Ty;
+    Type Ty = IceType_void;
     if (ValValue == 0 && CountValue >= BytesPerStoreq &&
         CountValue <= BytesPerStorep * Traits::MEMSET_UNROLL_LIMIT) {
       // When the value is zero it can be loaded into a vector register cheaply