diff --git a/src/vim9execute.c b/src/vim9execute.c
index dd36cfa..980ebb5 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -2432,6 +2432,7 @@
 		    else
 #endif
 		    {
+			SOURCING_LNUM = iptr->isn_lnum;
 			n1 = tv_get_number_chk(tv1, &error);
 			if (error)
 			    goto on_error;