diff --git a/xpcom/base/nsMemoryReporterManager.cpp b/xpcom/base/nsMemoryReporterManager.cpp
index 16341e973fc..a78897fa2fc 100644
--- a/xpcom/base/nsMemoryReporterManager.cpp
+++ b/xpcom/base/nsMemoryReporterManager.cpp
@@ -522,6 +522,8 @@ PrivateDistinguishedAmount(int64_t* aN)
 #ifdef HAVE_VSIZE_MAX_CONTIGUOUS_REPORTER
 class VsizeMaxContiguousReporter MOZ_FINAL : public nsIMemoryReporter
 {
+  ~VsizeMaxContiguousReporter() {}
+
 public:
   NS_DECL_ISUPPORTS
 
@@ -543,6 +545,8 @@ NS_IMPL_ISUPPORTS(VsizeMaxContiguousReporter, nsIMemoryReporter)
 #ifdef HAVE_PRIVATE_REPORTER
 class PrivateReporter MOZ_FINAL : public nsIMemoryReporter
 {
+  ~PrivateReporter() {}
+
 public:
   NS_DECL_ISUPPORTS