diff --git a/femtolisp/flisp.c b/femtolisp/flisp.c
index 802597b..8150d6d 100644
--- a/femtolisp/flisp.c
+++ b/femtolisp/flisp.c
@@ -1163,7 +1163,8 @@ static value_t eval_sexpr(value_t e, uint32_t penv, int tail)
                 f = Stack[SP-5];
                 Stack[SP-3] = car_(f);     // lambda list
                 Stack[SP-2] = fixnum(s);   // argument value
-                v = eval_sexpr(car_(cdr_(f)), SP-3, 0);
+                v = car_(cdr_(f));
+                if (!selfevaluating(v)) v = eval_sexpr(v, SP-3, 0);
             }
             break;
         case F_SPECIAL_APPLY:
diff --git a/femtolisp/unittest.lsp b/femtolisp/unittest.lsp
index 606993c..4671e07 100644
--- a/femtolisp/unittest.lsp
+++ b/femtolisp/unittest.lsp
@@ -66,6 +66,8 @@
 
 (assert (equal (string 'sym #char(65) #wchar(945) "blah") "symA\u03B1blah"))
 
+; this crashed once
+(for 1 10 (lambda (i) 0))
 
 ; ok, a couple end-to-end tests as well
 (define (fib n) (if (< n 2) n (+ (fib (- n 1)) (fib (- n 2)))))