diff --git a/js/src/xpconnect/src/nsXPConnect.cpp b/js/src/xpconnect/src/nsXPConnect.cpp
index 70c518d67c7..a48072ee3c9 100644
--- a/js/src/xpconnect/src/nsXPConnect.cpp
+++ b/js/src/xpconnect/src/nsXPConnect.cpp
@@ -596,10 +596,10 @@ nsXPConnect::Traverse(void *p, nsCycleCollectionTraversalCallback &cb)
         XPCWrappedNative* wn = XPCNativeWrapper::GetWrappedNative(cx, obj);
         XPCNativeScriptableInfo* si = wn ? wn->GetScriptableInfo() : nsnull;
         if(si)
-            snprintf(name, sizeof(name), "XPCNativeWrapper (%s)",
-                     si->GetJSClass()->name);
+            JS_snprintf(name, sizeof(name), "XPCNativeWrapper (%s)",
+                        si->GetJSClass()->name);
         else
-            snprintf(name, sizeof(name), "XPCNativeWrapper");
+            JS_snprintf(name, sizeof(name), "XPCNativeWrapper");
     }
     else if(obj)
     {
@@ -611,14 +611,14 @@ nsXPConnect::Traverse(void *p, nsCycleCollectionTraversalCallback &cb)
             si = p->GetScriptableInfo();
         }
         if(si)
-            snprintf(name, sizeof(name), "JS Object (%s - %s)", clazz->name,
-                     si->GetJSClass()->name);
+            JS_snprintf(name, sizeof(name), "JS Object (%s - %s)", clazz->name,
+                        si->GetJSClass()->name);
         else
-            snprintf(name, sizeof(name), "JS Object (%s)", clazz->name);
+            JS_snprintf(name, sizeof(name), "JS Object (%s)", clazz->name);
     }
     else
     {
-        snprintf(name, sizeof(name), "JS Object");
+        JS_snprintf(name, sizeof(name), "JS Object");
     }
     cb.DescribeNode(refcount, sizeof(JSObject), name);
 #else
diff --git a/js/src/xpconnect/src/xpcwrappedjs.cpp b/js/src/xpconnect/src/xpcwrappedjs.cpp
index b98d506a6a1..fee0b5faf77 100644
--- a/js/src/xpconnect/src/xpcwrappedjs.cpp
+++ b/js/src/xpconnect/src/xpcwrappedjs.cpp
@@ -83,8 +83,8 @@ NS_CYCLE_COLLECTION_CLASSNAME(nsXPCWrappedJS)::Traverse
     nsrefcnt refcnt = tmp->mRefCnt.get();
 #ifdef DEBUG
     char name[72];
-    snprintf(name, sizeof(name), "nsXPCWrappedJS (%s)",
-             tmp->GetClass()->GetInterfaceName());
+    JS_snprintf(name, sizeof(name), "nsXPCWrappedJS (%s)",
+                tmp->GetClass()->GetInterfaceName());
     cb.DescribeNode(refcnt, sizeof(nsXPCWrappedJS), name);
 #else
     cb.DescribeNode(refcnt, sizeof(nsXPCWrappedJS), "nsXPCWrappedJS");
diff --git a/js/src/xpconnect/src/xpcwrappednative.cpp b/js/src/xpconnect/src/xpcwrappednative.cpp
index c7668575660..bc48097c1fa 100644
--- a/js/src/xpconnect/src/xpcwrappednative.cpp
+++ b/js/src/xpconnect/src/xpcwrappednative.cpp
@@ -61,10 +61,10 @@ NS_CYCLE_COLLECTION_CLASSNAME(XPCWrappedNative)::Traverse(nsISupports *s,
     char name[72];
     XPCNativeScriptableInfo* si = tmp->GetScriptableInfo();
     if(si)
-        snprintf(name, sizeof(name), "XPCWrappedNative (%s)",
-                 si->GetJSClass()->name);
+        JS_snprintf(name, sizeof(name), "XPCWrappedNative (%s)",
+                    si->GetJSClass()->name);
     else
-        snprintf(name, sizeof(name), "XPCWrappedNative");
+        JS_snprintf(name, sizeof(name), "XPCWrappedNative");
 
     cb.DescribeNode(tmp->mRefCnt.get(), sizeof(XPCWrappedNative), name);
 #else