diff --git a/include/FileSystem.h b/include/FileSystem.h
index 80832ba2..c3bc63e3 100644
--- a/include/FileSystem.h
+++ b/include/FileSystem.h
@@ -69,8 +69,8 @@ public:
 	virtual bool write_uuid( const Partition & partition, OperationDetail & operationdetail ) { return false; };
 	virtual bool create( const Partition & new_partition, OperationDetail & operationdetail ) { return false; };
 	virtual bool resize( const Partition & partition_new,
-			     OperationDetail & operationdetail,
-			     bool fill_partition = false ) { return false; };
+	                     OperationDetail & operationdetail,
+	                     bool fill_partition ) { return false; };
 	virtual bool move( const Partition & partition_new
 	                 , const Partition & partition_old
 	                 , OperationDetail & operationdetail
diff --git a/include/btrfs.h b/include/btrfs.h
index 619f8cf9..491ca8af 100644
--- a/include/btrfs.h
+++ b/include/btrfs.h
@@ -43,7 +43,7 @@ public:
 	void read_uuid( Partition & partition ) ;
 	bool write_uuid( const Partition & partition, OperationDetail & operationdetail );
 	bool create( const Partition & new_partition, OperationDetail & operationdetail ) ;
-	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition = false ) ;
+	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition );
 	bool check_repair( const Partition & partition, OperationDetail & operationdetail ) ;
 
 	static void clear_cache() ;
diff --git a/include/ext2.h b/include/ext2.h
index fc0a39a2..7a5e00b5 100644
--- a/include/ext2.h
+++ b/include/ext2.h
@@ -50,7 +50,7 @@ public:
 	void read_uuid( Partition & partition ) ;
 	bool write_uuid( const Partition & partition, OperationDetail & operationdetail ) ;
 	bool create( const Partition & new_partition, OperationDetail & operationdetail ) ;
-	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition = false ) ;
+	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition );
 	bool check_repair( const Partition & partition, OperationDetail & operationdetail ) ;
 	bool move( const Partition & partition_new,
 	           const Partition & partition_old,
diff --git a/include/jfs.h b/include/jfs.h
index b0cfa863..089049f6 100644
--- a/include/jfs.h
+++ b/include/jfs.h
@@ -35,7 +35,7 @@ public:
 	void read_uuid( Partition & partition ) ;
 	bool write_uuid( const Partition & partition, OperationDetail & operationdetail ) ;
 	bool create( const Partition & new_partition, OperationDetail & operationdetail ) ;
-	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition = false ) ;
+	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition );
 	bool check_repair( const Partition & partition, OperationDetail & operationdetail ) ;
 };
 
diff --git a/include/linux_swap.h b/include/linux_swap.h
index cdf1c09c..b856495f 100644
--- a/include/linux_swap.h
+++ b/include/linux_swap.h
@@ -37,7 +37,7 @@ public:
 	void read_uuid( Partition & partition ) ;
 	bool write_uuid( const Partition & partition, OperationDetail & operationdetail ) ;
 	bool create( const Partition & new_partition, OperationDetail & operationdetail ) ;
-	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition = false ) ;
+	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition );
 	bool move( const Partition & partition_new
 	         , const Partition & partition_old
 	         , OperationDetail & operationdetail
diff --git a/include/lvm2_pv.h b/include/lvm2_pv.h
index 1a850ef6..0f471577 100644
--- a/include/lvm2_pv.h
+++ b/include/lvm2_pv.h
@@ -32,7 +32,7 @@ public:
 	bool is_busy( const Glib::ustring & path ) ;
 	void set_used_sectors( Partition & partition ) ;
 	bool create( const Partition & new_partition, OperationDetail & operationdetail ) ;
-	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition = false ) ;
+	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition );
 	bool check_repair( const Partition & partition, OperationDetail & operationdetail ) ;
 	bool remove( const Partition & partition, OperationDetail & operationdetail ) ;
 };
diff --git a/include/nilfs2.h b/include/nilfs2.h
index c90f8bba..7e85b4ee 100644
--- a/include/nilfs2.h
+++ b/include/nilfs2.h
@@ -34,7 +34,7 @@ public:
 	void read_uuid( Partition & partition ) ;
 	bool write_uuid( const Partition & partition, OperationDetail & operationdetail ) ;
 	bool create( const Partition & new_partition, OperationDetail & operationdetail ) ;
-	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition = false ) ;
+	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition );
 };
 
 } //GParted
diff --git a/include/ntfs.h b/include/ntfs.h
index 660480b2..1285aa9f 100644
--- a/include/ntfs.h
+++ b/include/ntfs.h
@@ -36,7 +36,7 @@ public:
 	void read_uuid( Partition & partition ) ;
 	bool write_uuid( const Partition & partition, OperationDetail & operationdetail ) ;
 	bool create( const Partition & new_partition, OperationDetail & operationdetail ) ;
-	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition = false ) ;
+	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition );
 	bool copy( const Partition & src_part, 
 		   Partition & dest_part,
 		   OperationDetail & operationdetail ) ;
diff --git a/include/reiserfs.h b/include/reiserfs.h
index aadb114e..888710ea 100644
--- a/include/reiserfs.h
+++ b/include/reiserfs.h
@@ -35,7 +35,7 @@ public:
 	void read_uuid( Partition & partition ) ;
 	bool write_uuid( const Partition & partition, OperationDetail & operationdetail ) ;
 	bool create( const Partition & new_partition, OperationDetail & operationdetail ) ;
-	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition = false ) ;
+	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition );
 	bool check_repair( const Partition & partition, OperationDetail & operationdetail ) ;
 };
 
diff --git a/include/xfs.h b/include/xfs.h
index 4ae0f678..b9803702 100644
--- a/include/xfs.h
+++ b/include/xfs.h
@@ -39,7 +39,7 @@ public:
 	void read_uuid( Partition & partition ) ;
 	bool write_uuid( const Partition & partition, OperationDetail & operationdetail ) ;
 	bool create( const Partition & new_partition, OperationDetail & operationdetail ) ;
-	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition = false ) ;
+	bool resize( const Partition & partition_new, OperationDetail & operationdetail, bool fill_partition );
 	bool copy( const Partition & src_part,
 		   Partition & dest_part,
 		   OperationDetail & operationdetail ) ;