diff --git a/src/net.cpp b/src/net.cpp
index 3a549d65c47..03db1f06a4c 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1973,11 +1973,11 @@ bool CAddrDB::Read(CAddrMan& addr)
         return error("%s: Failed to open file %s", __func__, pathAddr.string());
 
     // use file size to size memory buffer
-    int fileSize = boost::filesystem::file_size(pathAddr);
-    int dataSize = fileSize - sizeof(uint256);
+    uint64_t fileSize = boost::filesystem::file_size(pathAddr);
+    uint64_t dataSize = 0;
     // Don't try to resize to a negative number if file is small
-    if (dataSize < 0)
-        dataSize = 0;
+    if (fileSize >= sizeof(uint256))
+        dataSize = fileSize - sizeof(uint256);
     vector<unsigned char> vchData;
     vchData.resize(dataSize);
     uint256 hashIn;
@@ -2230,11 +2230,11 @@ bool CBanDB::Read(std::map<CSubNet, int64_t>& banSet)
         return error("%s: Failed to open file %s", __func__, pathBanlist.string());
 
     // use file size to size memory buffer
-    int fileSize = boost::filesystem::file_size(pathBanlist);
-    int dataSize = fileSize - sizeof(uint256);
+    uint64_t fileSize = boost::filesystem::file_size(pathBanlist);
+    uint64_t dataSize = 0;
     // Don't try to resize to a negative number if file is small
-    if (dataSize < 0)
-        dataSize = 0;
+    if (fileSize >= sizeof(uint256))
+        dataSize = fileSize - sizeof(uint256);
     vector<unsigned char> vchData;
     vchData.resize(dataSize);
     uint256 hashIn;