diff --git a/src/frontend/com_let.c b/src/frontend/com_let.c
index eae479e88..71e923f58 100644
--- a/src/frontend/com_let.c
+++ b/src/frontend/com_let.c
@@ -47,7 +47,7 @@ void com_let(wordlist *wl)
     int n_dst_index;
     struct pnode *names = (struct pnode *) NULL;
     struct dvec *vec_src = (struct dvec *) NULL;
-    struct plot *tplot;
+    struct plot *tplot = NULL;
 
     /* let with no arguments is equivalent to display */
     if (!wl) {