diff --git a/src/vim9execute.c b/src/vim9execute.c
index 23dee1c..a53b1b3 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -4470,7 +4470,7 @@
 		    ea.cmd = ea.arg = iptr->isn_arg.string;
 		    ga_init2(&lines_to_free, sizeof(char_u *), 50);
 		    SOURCING_LNUM = iptr->isn_lnum;
-		    define_function(&ea, NULL, &lines_to_free, 0);
+		    define_function(&ea, NULL, &lines_to_free, 0, NULL, 0);
 		    ga_clear_strings(&lines_to_free);
 		}
 		break;