4 files changed, 4 insertions, 4 deletions
diff --git a/mailnews/db/msgdb/public/nsDBFolderInfo.h b/mailnews/db/msgdb/public/nsDBFolderInfo.h
index 9b3a51348..b9747feb9 100644
--- a/mailnews/db/msgdb/public/nsDBFolderInfo.h
+++ b/mailnews/db/msgdb/public/nsDBFolderInfo.h
@@ -31,7 +31,7 @@ class nsDBFolderInfo : public nsIDBFolderInfo
 public:
   friend class nsMsgDatabase;
   
-  nsDBFolderInfo(nsMsgDatabase *mdb);
+  explicit nsDBFolderInfo(nsMsgDatabase *mdb);
   
   NS_DECL_ISUPPORTS
     // interface methods.
diff --git a/mailnews/db/msgdb/src/nsMailDatabase.cpp b/mailnews/db/msgdb/src/nsMailDatabase.cpp
index 13a53485f..b9202a4b2 100644
--- a/mailnews/db/msgdb/src/nsMailDatabase.cpp
+++ b/mailnews/db/msgdb/src/nsMailDatabase.cpp
@@ -336,7 +336,7 @@ public:
   // nsISimpleEnumerator methods:
   NS_DECL_NSISIMPLEENUMERATOR
 
-  nsMsgOfflineOpEnumerator(nsMailDatabase* db);
+  explicit nsMsgOfflineOpEnumerator(nsMailDatabase* db);
 
 protected:
   virtual ~nsMsgOfflineOpEnumerator();
diff --git a/mailnews/db/msgdb/src/nsMsgDatabase.cpp b/mailnews/db/msgdb/src/nsMsgDatabase.cpp
index 8b366ab5c..eb5f345f6 100644
--- a/mailnews/db/msgdb/src/nsMsgDatabase.cpp
+++ b/mailnews/db/msgdb/src/nsMsgDatabase.cpp
@@ -1024,7 +1024,7 @@ class MsgDBReporter final : public nsIMemoryReporter
 {
   nsMsgDatabase *mDatabase;
 public:
-  MsgDBReporter(nsMsgDatabase *db) : mDatabase(db) {}
+  explicit MsgDBReporter(nsMsgDatabase *db) : mDatabase(db) {}
 
   NS_DECL_ISUPPORTS
   NS_IMETHOD GetName(nsACString &aName)
diff --git a/mailnews/db/msgdb/src/nsMsgHdr.cpp b/mailnews/db/msgdb/src/nsMsgHdr.cpp
index ba1663e3b..136079473 100644
--- a/mailnews/db/msgdb/src/nsMsgHdr.cpp
+++ b/mailnews/db/msgdb/src/nsMsgHdr.cpp
@@ -998,7 +998,7 @@ public:
   NS_DECL_ISUPPORTS
   NS_DECL_NSIUTF8STRINGENUMERATOR
 
-  nsMsgPropertyEnumerator(nsMsgHdr* aHdr);
+  explicit nsMsgPropertyEnumerator(nsMsgHdr* aHdr);
   void PrefetchNext();
 
 protected: