diff --git a/src/main.cpp b/src/main.cpp
index 9fca183bb0..5d053e7813 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2577,7 +2577,7 @@ bool FindBlockPos(CValidationState &state, CDiskBlockPos &pos, unsigned int nAdd
         pos.nPos = vinfoBlockFile[nFile].nSize;
     }
 
-    if (nFile != nLastBlockFile) {
+    if ((int)nFile != nLastBlockFile) {
         if (!fKnown) {
             LogPrintf("Leaving block file %i: %s\n", nFile, vinfoBlockFile[nFile].ToString());
         }