diff --git a/lib-src/libnyquist/nyquist/xlisp/xlftab.c b/lib-src/libnyquist/nyquist/xlisp/xlftab.c
index 04458d4fd..5e070c59e 100644
--- a/lib-src/libnyquist/nyquist/xlisp/xlftab.c
+++ b/lib-src/libnyquist/nyquist/xlisp/xlftab.c
@@ -518,7 +518,7 @@ int xlbindfunctions(FUNDEF *functions, size_t nfunctions)
    memcpy(newfuntab, funtab, (szfuntab - 1) * sizeof(FUNDEF));
    memcpy(newfuntab + szfuntab - 1, functions, nfunctions * sizeof(FUNDEF));
    FUNDEF sentinel = { 0, 0, 0 };
-   newfuntab[szfuntab - 1] = sentinel;
+   newfuntab[szfuntab + nfunctions - 1] = sentinel;
    funtab = newfuntab;
    szfuntab += nfunctions;
    return TRUE;
diff --git a/lib-src/libnyquist/nyquist/xlisp/xlisp.h b/lib-src/libnyquist/nyquist/xlisp/xlisp.h
index 03c0ca636..4c7b4e8c0 100644
--- a/lib-src/libnyquist/nyquist/xlisp/xlisp.h
+++ b/lib-src/libnyquist/nyquist/xlisp/xlisp.h
@@ -673,7 +673,9 @@ void xlsymbols(void);
 
 /* xlftab.c */
 /* returns true on success,
-   false if table limits would be exceeded and the table remains unchanged */
+   false if table limits would be exceeded and the table remains unchanged
+   Call this, any number of times, before calling xlisp_main_init
+ */
 int xlbindfunctions(FUNDEF *functions, size_t nfunctions);
 
 /* xlio.c */