--- a/js/src/jit/shared/Assembler-shared.h
+++ b/js/src/jit/shared/Assembler-shared.h
@@ -309,17 +309,18 @@ struct PatchedAbsoluteAddress
 struct Address
 {
     Register base;
     int32_t offset;
 
     Address(Register base, int32_t offset) : base(base), offset(offset)
     { }
 
-    Address() { mozilla::PodZero(this); }
+    Address() : base(Registers::Invalid), offset(0)
+    { }
 };
 
 #if JS_BITS_PER_WORD == 32
 
 static inline Address
 LowWord(const Address& address) {
     CheckedInt<int32_t> offset = CheckedInt<int32_t>(address.offset) + INT64LOW_OFFSET;
     MOZ_ALWAYS_TRUE(offset.isValid());
@@ -343,17 +344,22 @@ struct BaseIndex
     Register index;
     Scale scale;
     int32_t offset;
 
     BaseIndex(Register base, Register index, Scale scale, int32_t offset = 0)
       : base(base), index(index), scale(scale), offset(offset)
     { }
 
-    BaseIndex() { mozilla::PodZero(this); }
+    BaseIndex()
+      : base(Registers::Invalid)
+      , index(Registers::Invalid)
+      , scale(TimesOne)
+      , offset(0)
+    {}
 };
 
 #if JS_BITS_PER_WORD == 32
 
 static inline BaseIndex
 LowWord(const BaseIndex& address) {
     CheckedInt<int32_t> offset = CheckedInt<int32_t>(address.offset) + INT64LOW_OFFSET;
     MOZ_ALWAYS_TRUE(offset.isValid());