diff --git a/src/modules/partition/jobs/MoveFileSystemJob.cpp b/src/modules/partition/jobs/MoveFileSystemJob.cpp
index bb0944f25..8ed1d65f8 100644
--- a/src/modules/partition/jobs/MoveFileSystemJob.cpp
+++ b/src/modules/partition/jobs/MoveFileSystemJob.cpp
@@ -170,11 +170,11 @@ MoveFileSystemJob::copyBlocks( Report& report, CopyTargetDevice& target, CopySou
     // copy the remainder
     if ( rval && lastBlock > 0 )
     {
-        Q_ASSERT( lastBlock < blockSize );
-
         if ( lastBlock >= blockSize )
             cLog() << "warning: lastBlock: " << lastBlock << ", blockSize: " << blockSize;
 
+        Q_ASSERT( lastBlock < blockSize );
+
         const qint64 lastBlockReadOffset = copyDir > 0 ? readOffset + blockSize * blocksCopied : source.firstSector();
         const qint64 lastBlockWriteOffset = copyDir > 0 ? writeOffset + blockSize * blocksCopied : target.firstSector();