Index: clang/lib/AST/Interp/ByteCodeExprGen.cpp
===================================================================
--- clang/lib/AST/Interp/ByteCodeExprGen.cpp
+++ clang/lib/AST/Interp/ByteCodeExprGen.cpp
@@ -359,10 +359,15 @@
 
 template <class Emitter>
 bool ByteCodeExprGen<Emitter>::VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
-  if (Optional<PrimType> T = classify(E))
-    return this->emitZero(*T, E);
+  Optional<PrimType> T = classify(E);
 
-  return false;
+  if (!T)
+    return false;
+
+  if (E->getType()->isPointerType())
+    return this->emitNullPtr(E);
+
+  return this->emitZero(*T, E);
 }
 
 template <class Emitter>
Index: clang/test/AST/Interp/literals.cpp
===================================================================
--- clang/test/AST/Interp/literals.cpp
+++ clang/test/AST/Interp/literals.cpp
@@ -49,7 +49,10 @@
   static_assert(!nu, "");
 };
 
-
+constexpr int UninitI; // expected-error {{must be initialized by a constant expression}} \
+                       // ref-error {{must be initialized by a constant expression}}
+constexpr int *UninitPtr; // expected-error {{must be initialized by a constant expression}} \
+                          // ref-error {{must be initialized by a constant expression}}
 
 constexpr bool getTrue() { return true; }
 constexpr bool getFalse() { return false; }