diff --git a/browser/branding/official/configure.sh b/browser/branding/official/configure.sh
index 55f3f1836eb1..92ef14e03f40 100644
--- a/browser/branding/official/configure.sh
+++ b/browser/branding/official/configure.sh
@@ -3,4 +3,3 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 MOZ_APP_DISPLAYNAME=Firefox
-MOZ_UA_BUILDID=20100101
diff --git a/configure.in b/configure.in
index 00881d6066c2..2eda61df26a4 100644
--- a/configure.in
+++ b/configure.in
@@ -8749,8 +8749,6 @@ AC_SUBST(MOZ_UA_OS_AGNOSTIC)
 if test -n "$MOZ_UA_OS_AGNOSTIC"; then
   AC_DEFINE(MOZ_UA_OS_AGNOSTIC)
 fi
-AC_DEFINE_UNQUOTED(MOZ_UA_BUILDID, "$MOZ_UA_BUILDID")
-AC_SUBST(MOZ_UA_BUILDID)
 
 AC_SUBST(MOZ_APP_STATIC_INI)
 
diff --git a/netwerk/protocol/http/nsHttpHandler.cpp b/netwerk/protocol/http/nsHttpHandler.cpp
index 50c4debd0b83..83c016f6859b 100644
--- a/netwerk/protocol/http/nsHttpHandler.cpp
+++ b/netwerk/protocol/http/nsHttpHandler.cpp
@@ -309,12 +309,8 @@ nsHttpHandler::Init()
 #ifdef ANDROID
     mProductSub.AssignLiteral(MOZILLA_UAVERSION);
 #else
-    mProductSub.AssignLiteral(MOZ_UA_BUILDID);
+    mProductSub.AssignLiteral("20100101");
 #endif
-    if (mProductSub.IsEmpty() && appInfo)
-        appInfo->GetPlatformBuildID(mProductSub);
-    if (mProductSub.Length() > 8)
-        mProductSub.SetLength(8);
 
 #if DEBUG
     // dump user agent prefs