diff --git a/src/main.cpp b/src/main.cpp
index 20bb56e964..bd51fe3068 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1845,11 +1845,11 @@ bool CheckDiskSpace(uint64 nAdditionalBytes)
 {
     uint64 nFreeBytesAvailable = filesystem::space(GetDataDir()).available;
 
-    // Check for 15MB because database could create another 10MB log file at any time
-    if (nFreeBytesAvailable < (uint64)15000000 + nAdditionalBytes)
+    // Check for nMinDiskSpace bytes (currently 50MB)
+    if (nFreeBytesAvailable < nMinDiskSpace + nAdditionalBytes)
     {
         fShutdown = true;
-        string strMessage = _("Warning: Disk space is low  ");
+        string strMessage = _("Warning: Disk space is low");
         strMiscWarning = strMessage;
         printf("*** %s\n", strMessage.c_str());
         ThreadSafeMessageBox(strMessage, "Bitcoin", wxOK | wxICON_EXCLAMATION | wxMODAL);
diff --git a/src/main.h b/src/main.h
index 5ac5547a3e..1fa2308b7f 100644
--- a/src/main.h
+++ b/src/main.h
@@ -75,8 +75,8 @@ extern unsigned char pchMessageStart[4];
 // Settings
 extern int64 nTransactionFee;
 
-
-
+// Minimum disk space required - used in CheckDiskSpace()
+static const uint64 nMinDiskSpace = 52428800;
 
 
 class CReserveKey;