diff --git a/src/eval.c b/src/eval.c
index 00b6c59..d76ec94 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -244,7 +244,8 @@
 	if (partial == NULL)
 	    return FAIL;
 
-	if (partial->pt_func != NULL && partial->pt_func->uf_dfunc_idx >= 0)
+	if (partial->pt_func != NULL
+			  && partial->pt_func->uf_dfunc_idx != UF_NOT_COMPILED)
 	{
 	    if (call_def_function(partial->pt_func, argc, argv,
 						       partial, rettv) == FAIL)