diff --git a/dom/src/base/nsLocation.cpp b/dom/src/base/nsLocation.cpp
index 02122198fdfb..8820e34ef1a1 100644
--- a/dom/src/base/nsLocation.cpp
+++ b/dom/src/base/nsLocation.cpp
@@ -151,7 +151,7 @@ LocationImpl::SetHash(const nsString& aHash)
       char *buf = aHash.ToNewCString();
       url->SetRef(buf);
       SetURL(url);
-      delete buf;
+      delete[] buf;
       NS_IF_RELEASE(url);      
     }
   }
@@ -202,7 +202,7 @@ LocationImpl::SetHost(const nsString& aHost)
       char *buf = aHost.ToNewCString();
       url->SetHost(buf);
       SetURL(url);
-      delete buf;
+      delete[] buf;
       NS_IF_RELEASE(url);      
     }
   }
@@ -246,7 +246,7 @@ LocationImpl::SetHostname(const nsString& aHostname)
       char *buf = aHostname.ToNewCString();
       url->SetHost(buf);
       SetURL(url);
-      delete buf;
+      delete[] buf;
       NS_IF_RELEASE(url);      
     }
   }
@@ -335,7 +335,7 @@ LocationImpl::SetPathname(const nsString& aPathname)
       char *buf = aPathname.ToNewCString();
       url->SetFile(buf);
       SetURL(url);
-      delete buf;
+      delete[] buf;
       NS_IF_RELEASE(url);      
     }
   }
@@ -391,7 +391,7 @@ LocationImpl::SetPort(const nsString& aPort)
       }
       url->SetHostPort(port);
       SetURL(url);
-      delete buf;
+      delete[] buf;
       NS_IF_RELEASE(url);      
     }
   }
@@ -437,7 +437,7 @@ LocationImpl::SetProtocol(const nsString& aProtocol)
       char *buf = aProtocol.ToNewCString();
       url->SetProtocol(buf);
       SetURL(url);
-      delete buf;
+      delete[] buf;
       NS_IF_RELEASE(url);      
     }
   }
@@ -486,7 +486,7 @@ LocationImpl::SetSearch(const nsString& aSearch)
       char *buf = aSearch.ToNewCString();
       url->SetSearch(buf);
       SetURL(url);
-      delete buf;
+      delete[] buf;
       NS_IF_RELEASE(url);      
     }
   }
diff --git a/dom/src/build/nsDOMFactory.cpp b/dom/src/build/nsDOMFactory.cpp
index 11f5a2810dd1..3362f1e78295 100644
--- a/dom/src/build/nsDOMFactory.cpp
+++ b/dom/src/build/nsDOMFactory.cpp
@@ -359,7 +359,7 @@ nsDOMScriptObjectFactory::NewScriptElement(const nsString &aTagName,
   nsDOMHTMLTag tag = NS_DOMTagToEnum(str);
 
   if (str) {
-    delete str;
+    delete[] str;
   }
 
   switch (tag) {
diff --git a/dom/src/events/nsJSEventListener.cpp b/dom/src/events/nsJSEventListener.cpp
index 6968f9543b6b..f968ae634579 100644
--- a/dom/src/events/nsJSEventListener.cpp
+++ b/dom/src/events/nsJSEventListener.cpp
@@ -78,11 +78,11 @@ nsresult nsJSEventListener::ProcessEvent(nsIDOMEvent* aEvent)
   mEventChars = mEventString.ToNewCString();
 
   if (!JS_LookupProperty(mContext, mJSObj, mEventChars, &funval)) {
-    delete mEventChars;
+    delete[] mEventChars;
     return NS_ERROR_FAILURE;
   }
 
-  delete mEventChars;
+  delete[] mEventChars;
 
   if (JS_TypeOfValue(mContext, funval) != JSTYPE_FUNCTION) {
     return NS_OK;