diff --git a/src/version.c b/src/version.c
index 22a2751..834196d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2786,
+/**/
     2785,
 /**/
     2784,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 027f79d..0695879 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -9416,8 +9416,15 @@
 	    break;
 
 	case ISN_SUBSTITUTE:
-	    vim_free(isn->isn_arg.subs.subs_cmd);
-	    vim_free(isn->isn_arg.subs.subs_instr);
+	    {
+		int	idx;
+		isn_T	*list = isn->isn_arg.subs.subs_instr;
+
+		vim_free(isn->isn_arg.subs.subs_cmd);
+		for (idx = 0; list[idx].isn_type != ISN_FINISH; ++idx)
+		    delete_instr(list + idx);
+		vim_free(list);
+	    }
 	    break;
 
 	case ISN_LOADS: