X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/135e949699b889c8c9088bb05f810d44adc74246..35cf75e9dc615e150c2696106c86e342c8a150f4:/src/src/functions.h

diff --git a/src/src/functions.h b/src/src/functions.h
index c9d00df10..dd6c9810b 100644
--- a/src/src/functions.h
+++ b/src/src/functions.h
@@ -104,7 +104,7 @@ extern uschar *auth_xtextencode(uschar *, int);
 extern int     auth_xtextdecode(uschar *, uschar **);
 
 extern uschar *b64encode(uschar *, int);
-extern int     b64decode(uschar *, uschar **);
+extern int     b64decode(const uschar *, uschar **);
 extern int     bdat_getc(unsigned);
 extern uschar *bdat_getbuf(unsigned *);
 extern int     bdat_ungetc(int);