diff --git a/src/ext2.cc b/src/ext2.cc
index 34f50ec7..c77d49ac 100644
--- a/src/ext2.cc
+++ b/src/ext2.cc
@@ -189,8 +189,8 @@ bool ext2::resize( const Partition & partition_new, OperationDetail & operationd
 	Glib::ustring str_temp = "resize2fs -p " + partition_new .get_path() ;
 	
 	if ( ! fill_partition )
-		str_temp += " " + Utils::num_to_str( Utils::round( Utils::sector_to_unit( 
-					partition_new .get_sector_length(), partition_new .sector_size, UNIT_KIB ) ) ) + "K" ;
+		str_temp += " " + Utils::num_to_str( floor( Utils::sector_to_unit(
+					partition_new .get_sector_length(), partition_new .sector_size, UNIT_KIB ) ) ) + "K";
 
 	return ! execute_command( str_temp, operationdetail ) ;
 }
diff --git a/src/ntfs.cc b/src/ntfs.cc
index 6ac19cb3..61da5012 100644
--- a/src/ntfs.cc
+++ b/src/ntfs.cc
@@ -203,7 +203,7 @@ bool ntfs::resize( const Partition & partition_new, OperationDetail & operationd
 	Glib::ustring size = "" ;
 	if ( ! fill_partition )
 	{
-		size = " -s " + Utils::num_to_str( Utils::round( Utils::sector_to_unit(
+		size = " -s " + Utils::num_to_str( floor( Utils::sector_to_unit(
 				partition_new .get_sector_length(), partition_new .sector_size, UNIT_BYTE ) ) ) ;
 	}
 	Glib::ustring cmd = "ntfsresize --force --force" + size ;
diff --git a/src/reiserfs.cc b/src/reiserfs.cc
index 2c44471d..fc89a08b 100644
--- a/src/reiserfs.cc
+++ b/src/reiserfs.cc
@@ -165,7 +165,7 @@ bool reiserfs::resize( const Partition & partition_new, OperationDetail & operat
 	Glib::ustring size = "" ;
 	if ( ! fill_partition )
 	{
-		size = " -s " + Utils::num_to_str( Utils::round( Utils::sector_to_unit(
+		size = " -s " + Utils::num_to_str( floor( Utils::sector_to_unit(
 		                   partition_new .get_sector_length(), partition_new .sector_size, UNIT_BYTE ) ) ) ;
 	}
 	Glib::ustring cmd = "sh -c 'echo y | resize_reiserfs" + size + " " + partition_new .get_path() + "'" ;