--- a/netwerk/protocol/http/nsHttpHandler.cpp
+++ b/netwerk/protocol/http/nsHttpHandler.cpp
@@ -23,17 +23,17 @@
 #include "nsIPrefService.h"
 #include "nsIPrefBranch.h"
 #include "nsIPrefLocalizedString.h"
 #include "nsISocketProviderService.h"
 #include "nsISocketProvider.h"
 #include "nsPrintfCString.h"
 #include "nsCOMPtr.h"
 #include "nsNetCID.h"
-#include "prprf.h"
+#include "mozilla/Printf.h"
 #include "mozilla/Sprintf.h"
 #include "nsAsyncRedirectVerifyHelper.h"
 #include "nsSocketTransportService2.h"
 #include "nsAlgorithm.h"
 #include "ASpdySession.h"
 #include "EventTokenBucket.h"
 #include "Tickler.h"
 #include "nsIXULAppInfo.h"
@@ -874,22 +874,22 @@ nsHttpHandler::InitUserAgentComponents()
         BOOL isWow64 = FALSE;
         if (!IsWow64Process(GetCurrentProcess(), &isWow64)) {
             isWow64 = FALSE;
         }
         format = isWow64
           ? WNT_BASE "; WOW64"
           : WNT_BASE;
 #endif
-        char *buf = PR_smprintf(format,
-                                info.dwMajorVersion,
-                                info.dwMinorVersion);
+        char *buf = mozilla::Smprintf(format,
+                               info.dwMajorVersion,
+                               info.dwMinorVersion);
         if (buf) {
             mOscpu = buf;
-            PR_smprintf_free(buf);
+            mozilla::SmprintfFree(buf);
         }
     }
 #elif defined (XP_MACOSX)
 #if defined(__ppc__)
     mOscpu.AssignLiteral("PPC Mac OS X");
 #elif defined(__i386__) || defined(__x86_64__)
     mOscpu.AssignLiteral("Intel Mac OS X");
 #endif