diff --git a/cpctelera/tools/2cdt/src/2cdt.c b/cpctelera/tools/2cdt/src/2cdt.c
index 8cc34d4a4..dac693edc 100644
--- a/cpctelera/tools/2cdt/src/2cdt.c
+++ b/cpctelera/tools/2cdt/src/2cdt.c
@@ -20,6 +20,7 @@
 /* The following program is designed to create a .tzx/.cdt from a tape-file stored
 on the PC */
 
+#include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/cpctelera/tools/2cdt/src/tzxfile.h b/cpctelera/tools/2cdt/src/tzxfile.h
index de05a9aae..880ca0ac0 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