diff --git a/mozilla/string/obsolete/nsStr.h b/mozilla/string/obsolete/nsStr.h
index ac78e143bf8..8f6776bbb83 100644
--- a/mozilla/string/obsolete/nsStr.h
+++ b/mozilla/string/obsolete/nsStr.h
@@ -200,6 +200,16 @@ public:
 
 struct NS_COM nsStr {  
 
+//----------------------------------------------------------------------------------------
+
+  nsStr() {
+    MOZ_COUNT_CTOR(nsStr);
+  }
+
+  ~nsStr() {
+    MOZ_COUNT_DTOR(nsStr);
+  }
+
  /**
   * This method initializes an nsStr for use
   *
diff --git a/mozilla/xpcom/ds/nsStr.h b/mozilla/xpcom/ds/nsStr.h
index ac78e143bf8..8f6776bbb83 100644
--- a/mozilla/xpcom/ds/nsStr.h
+++ b/mozilla/xpcom/ds/nsStr.h
@@ -200,6 +200,16 @@ public:
 
 struct NS_COM nsStr {  
 
+//----------------------------------------------------------------------------------------
+
+  nsStr() {
+    MOZ_COUNT_CTOR(nsStr);
+  }
+
+  ~nsStr() {
+    MOZ_COUNT_DTOR(nsStr);
+  }
+
  /**
   * This method initializes an nsStr for use
   *
diff --git a/mozilla/xpcom/string/obsolete/nsStr.h b/mozilla/xpcom/string/obsolete/nsStr.h
index ac78e143bf8..8f6776bbb83 100644
--- a/mozilla/xpcom/string/obsolete/nsStr.h
+++ b/mozilla/xpcom/string/obsolete/nsStr.h
@@ -200,6 +200,16 @@ public:
 
 struct NS_COM nsStr {  
 
+//----------------------------------------------------------------------------------------
+
+  nsStr() {
+    MOZ_COUNT_CTOR(nsStr);
+  }
+
+  ~nsStr() {
+    MOZ_COUNT_DTOR(nsStr);
+  }
+
  /**
   * This method initializes an nsStr for use
   *