diff --git a/src/addrman.cpp b/src/addrman.cpp
index c41ee3f9f..b605f4351 100644
--- a/src/addrman.cpp
+++ b/src/addrman.cpp
@@ -8,8 +8,6 @@
 #include "serialize.h"
 #include "streams.h"
 
-using namespace std;
-
 int CAddrInfo::GetTriedBucket(const uint256& nKey) const
 {
     uint64_t hash1 = (CHashWriter(SER_GETHASH, 0) << nKey << GetKey()).GetHash().GetCheapHash();
@@ -68,7 +66,7 @@ double CAddrInfo::GetChance(int64_t nNow) const
         fChance *= 0.01;
 
     // deprioritize 66% after each failed attempt, but at most 1/28th to avoid the search taking forever or overly penalizing outages.
-    fChance *= pow(0.66, min(nAttempts, 8));
+    fChance *= pow(0.66, std::min(nAttempts, 8));
 
     return fChance;
 }
@@ -258,7 +256,7 @@ bool CAddrMan::Add_(const CAddress& addr, const CNetAddr& source, int64_t nTimeP
         bool fCurrentlyOnline = (GetAdjustedTime() - addr.nTime < 24 * 60 * 60);
         int64_t nUpdateInterval = (fCurrentlyOnline ? 60 * 60 : 24 * 60 * 60);
         if (addr.nTime && (!pinfo->nTime || pinfo->nTime < addr.nTime - nUpdateInterval - nTimePenalty))
-            pinfo->nTime = max((int64_t)0, addr.nTime - nTimePenalty);
+            pinfo->nTime = std::max((int64_t)0, addr.nTime - nTimePenalty);
 
         // add services
         pinfo->nServices |= addr.nServices;
@@ -283,7 +281,7 @@ bool CAddrMan::Add_(const CAddress& addr, const CNetAddr& source, int64_t nTimeP
             return false;
     } else {
         pinfo = Create(addr, source, &nId);
-        pinfo->nTime = max((int64_t)0, (int64_t)pinfo->nTime - nTimePenalty);
+        pinfo->nTime = std::max((int64_t)0, (int64_t)pinfo->nTime - nTimePenalty);
         nNew++;
         fNew = true;
     }
diff --git a/src/addrman.h b/src/addrman.h
index 373b0f39f..2623d8980 100644
--- a/src/addrman.h
+++ b/src/addrman.h
@@ -458,7 +458,7 @@ public:
     }
 
     //! Return the number of (unique) addresses in all tables.
-    int size()
+    size_t size() const
     {
         return vRandom.size();
     }