diff --git a/src/XrdMacaroons/XrdMacaroonsHandler.cc b/src/XrdMacaroons/XrdMacaroonsHandler.cc
index dab3c62336a..e6d02e18671 100644
--- a/src/XrdMacaroons/XrdMacaroonsHandler.cc
+++ b/src/XrdMacaroons/XrdMacaroonsHandler.cc
@@ -568,8 +568,7 @@ Handler::GenerateMacaroonResponse(XrdHttpExtReq &req, const std::string &resourc
 
     size_t size_hint = macaroon_serialize_size_hint(mac_with_date);
 
-    std::vector<char> macaroon_resp; macaroon_resp.reserve(size_hint);
-    macaroon_resp.push_back((char)0);
+    std::vector<char> macaroon_resp; macaroon_resp.resize(size_hint);
     if (macaroon_serialize(mac_with_date, &macaroon_resp[0], size_hint, &mac_err))
     {
         printf("Returned macaroon_serialize code: %lu\n", (unsigned long)size_hint);
diff --git a/src/XrdThrottle/XrdThrottleManager.cc b/src/XrdThrottle/XrdThrottleManager.cc
index ad255f88a8d..8bea2374582 100644
--- a/src/XrdThrottle/XrdThrottleManager.cc
+++ b/src/XrdThrottle/XrdThrottleManager.cc
@@ -48,10 +48,10 @@ XrdThrottleManager::Init()
 {
    TRACE(DEBUG, "Initializing the throttle manager.");
    // Initialize all our shares to zero.
-   m_primary_bytes_shares.reserve(m_max_users);
-   m_secondary_bytes_shares.reserve(m_max_users);
-   m_primary_ops_shares.reserve(m_max_users);
-   m_secondary_ops_shares.reserve(m_max_users);
+   m_primary_bytes_shares.resize(m_max_users);
+   m_secondary_bytes_shares.resize(m_max_users);
+   m_primary_ops_shares.resize(m_max_users);
+   m_secondary_ops_shares.resize(m_max_users);
    // Allocate each user 100KB and 10 ops to bootstrap;
    for (int i=0; i<m_max_users; i++)
    {
diff --git a/src/XrdTpc/XrdTpcStream.hh b/src/XrdTpc/XrdTpcStream.hh
index 0e854334d53..9c61d7b1301 100644
--- a/src/XrdTpc/XrdTpcStream.hh
+++ b/src/XrdTpc/XrdTpcStream.hh
@@ -113,9 +113,9 @@ private:
             }
 
             // Inflate the underlying buffer if needed.
-            ssize_t new_bytes_needed = (m_size + size) - m_buffer.capacity();
+            ssize_t new_bytes_needed = (m_size + size) - m_buffer.size();
             if (new_bytes_needed > 0) {
-                m_buffer.reserve(m_capacity);
+                m_buffer.resize(m_capacity);
             }
 
             // Finally, do the copy.