diff --git a/cpctelera/tools/2cdt/src/2cdt.c b/cpctelera/tools/2cdt/src/2cdt.c
index 8cc34d4a4..f4a184ad0 100644
--- a/cpctelera/tools/2cdt/src/2cdt.c
+++ b/cpctelera/tools/2cdt/src/2cdt.c
@@ -23,6 +23,7 @@ on the PC */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <ctype.h>
 #include "defs.h"
 #include "tzxfile.h"
 #include "getopt.h"
diff --git a/cpctelera/tools/2cdt/src/tzxfile.h b/cpctelera/tools/2cdt/src/tzxfile.h
index de05a9aae..2419c085c 100644
--- a/cpctelera/tools/2cdt/src/tzxfile.h
+++ b/cpctelera/tools/2cdt/src/tzxfile.h
@@ -75,5 +75,6 @@ int	TZX_GetBlockHeaderSize(unsigned char ID);
 BOOL TZX_BlockHasData(unsigned char ID);
 TZX_BLOCK *TZX_CreateBlock(unsigned char ID);
 void	TZX_SetupPauseBlock(TZX_BLOCK *pBlock,unsigned long PauseInMilliseconds);
+void	TZX_AppendFile(TZX_FILE *pTZXFile, unsigned char *pFilename);
 #endif