--- a/mozglue/build/WindowsDllBlocklist.cpp
+++ b/mozglue/build/WindowsDllBlocklist.cpp
@@ -860,17 +860,19 @@ static WindowsDllInterceptor Kernel32Int
 MFBT_API void
 DllBlocklist_Initialize(uint32_t aInitFlags)
 {
   if (sBlocklistInitAttempted) {
     return;
   }
   sInitFlags = aInitFlags;
   sBlocklistInitAttempted = true;
+#if defined(NIGHTLY_BUILD)
   gStartAddressesToBlock = new mozilla::Vector<void*, 4>;
+#endif
 
   // In order to be effective against AppInit DLLs, the blocklist must be
   // initialized before user32.dll is loaded into the process (bug 932100).
   if (GetModuleHandleA("user32.dll")) {
     sUser32BeforeBlocklist = true;
 #ifdef DEBUG
     printf_stderr("DLL blocklist was unable to intercept AppInit DLLs.\n");
 #endif