diff --git a/src/ExpandVolume/DlgExpandVolume.cpp b/src/ExpandVolume/DlgExpandVolume.cpp
index c1acd769..adc8fa0d 100644
--- a/src/ExpandVolume/DlgExpandVolume.cpp
+++ b/src/ExpandVolume/DlgExpandVolume.cpp
@@ -717,7 +717,7 @@ void ExpandVolumeWizard (HWND hwndDlg, wchar_t *lpszVolume)
 
 		if ( !bIsDevice )
 		{
-			if ( newVolumeSize < hostSize + TC_MINVAL_FS_EXPAND)
+			if ( (newVolumeSize < hostSize + TC_MINVAL_FS_EXPAND) && ((hostSize == volSize) || (newVolumeSize != hostSize) || ((hostSize - volSize) < TC_MINVAL_FS_EXPAND)))
 			{
 				StringCbPrintfW(szTmp,sizeof(szTmp),L"New volume size too small, must be at least %I64u kB larger than the current size.",TC_MINVAL_FS_EXPAND/BYTES_PER_KB);
 				MessageBoxW (hwndDlg, szTmp, lpszTitle, MB_OK | MB_ICONEXCLAMATION );
diff --git a/src/ExpandVolume/ExpandVolume.c b/src/ExpandVolume/ExpandVolume.c
index 5a476ba3..588e7688 100644
--- a/src/ExpandVolume/ExpandVolume.c
+++ b/src/ExpandVolume/ExpandVolume.c
@@ -750,13 +750,24 @@ static int ExpandVolume (HWND hwndDlg, wchar_t *lpszVolume, Password *pVolumePas
 
 		liNewSize.QuadPart=(LONGLONG)newHostSize;
 
-		// Preallocate the file
-		if (!SetFilePointerEx (dev, liNewSize, NULL, FILE_BEGIN)
-			|| !SetEndOfFile (dev)
-			|| SetFilePointer (dev, 0, NULL, FILE_BEGIN) != 0)
+		if (hostSize != newHostSize)
 		{
-			nStatus = ERR_OS_ERROR;
-			goto error;
+			// Preallocate the file
+			if (!SetFilePointerEx (dev, liNewSize, NULL, FILE_BEGIN)
+				|| !SetEndOfFile (dev)
+				|| SetFilePointer (dev, 0, NULL, FILE_BEGIN) != 0)
+			{
+				nStatus = ERR_OS_ERROR;
+				goto error;
+			}
+		}
+		else
+		{
+			if (SetFilePointer (dev, 0, NULL, FILE_BEGIN) != 0)
+			{
+				nStatus = ERR_OS_ERROR;
+				goto error;
+			}
 		}
 	}