diff --git a/include/Support/DenseMap.h b/include/Support/DenseMap.h
index 9d713d97c36..9d55435c91f 100644
--- a/include/Support/DenseMap.h
+++ b/include/Support/DenseMap.h
@@ -33,7 +33,7 @@ class DenseMap {
     ToIndexT toIndex_;
 
 public:
-    DenseMap() { }
+    DenseMap() : nullVal_(T()) { }
 
     explicit DenseMap(const T& val) : nullVal_(val) { }
 
diff --git a/include/llvm/ADT/DenseMap.h b/include/llvm/ADT/DenseMap.h
index 9d713d97c36..9d55435c91f 100644
--- a/include/llvm/ADT/DenseMap.h
+++ b/include/llvm/ADT/DenseMap.h
@@ -33,7 +33,7 @@ class DenseMap {
     ToIndexT toIndex_;
 
 public:
-    DenseMap() { }
+    DenseMap() : nullVal_(T()) { }
 
     explicit DenseMap(const T& val) : nullVal_(val) { }
 
diff --git a/include/llvm/ADT/IndexedMap.h b/include/llvm/ADT/IndexedMap.h
index 9d713d97c36..9d55435c91f 100644
--- a/include/llvm/ADT/IndexedMap.h
+++ b/include/llvm/ADT/IndexedMap.h
@@ -33,7 +33,7 @@ class DenseMap {
     ToIndexT toIndex_;
 
 public:
-    DenseMap() { }
+    DenseMap() : nullVal_(T()) { }
 
     explicit DenseMap(const T& val) : nullVal_(val) { }