diff --git a/netwerk/protocol/http/nsHttpConnectionMgr.cpp b/netwerk/protocol/http/nsHttpConnectionMgr.cpp
index 08fccd0f5863..5c40ca543dcc 100644
--- a/netwerk/protocol/http/nsHttpConnectionMgr.cpp
+++ b/netwerk/protocol/http/nsHttpConnectionMgr.cpp
@@ -2551,7 +2551,7 @@ nsHttpConnectionMgr::OnMsgSpeculativeConnect(int32_t, void *param)
     if (preferredEntry)
         ent = preferredEntry;
 
-    if (mNumHalfOpenConns <= gHttpHandler->ParallelSpeculativeConnectLimit() &&
+    if (mNumHalfOpenConns < gHttpHandler->ParallelSpeculativeConnectLimit() &&
         !ent->mIdleConns.Length() && !RestrictConnections(ent) &&
         !AtActiveConnectionLimit(ent, trans->Caps())) {
         CreateTransport(ent, trans, trans->Caps(), true);
diff --git a/netwerk/test/unit/test_spdy.js b/netwerk/test/unit/test_spdy.js
index d388b3864c61..a9a5969753b2 100644
--- a/netwerk/test/unit/test_spdy.js
+++ b/netwerk/test/unit/test_spdy.js
@@ -331,13 +331,18 @@ function addCertOverride(host, port, bits) {
 function run_test() {
   // Set to allow the cert presented by our SPDY server
   do_get_profile();
+  var prefs = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);
+  var oldPref = prefs.getIntPref("network.http.speculative-parallel-limit");
+  prefs.setIntPref("network.http.speculative-parallel-limit", 0);
+
   addCertOverride("localhost", 4443,
                   Ci.nsICertOverrideService.ERROR_UNTRUSTED |
                   Ci.nsICertOverrideService.ERROR_MISMATCH |
                   Ci.nsICertOverrideService.ERROR_TIME);
 
+  prefs.setIntPref("network.http.speculative-parallel-limit", oldPref);
+
   // Make sure spdy is enabled
-  var prefs = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);
   prefs.setBoolPref("network.http.spdy.enabled", true);
 
   // And make go!