diff --git a/src/vim9execute.c b/src/vim9execute.c
index 84de4fe..04d5e5f 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -1396,6 +1396,27 @@
     return OK;
 }
 
+/*
+ * Execute iptr->isn_arg.string as an Ex command.
+ */
+    static int
+exec_command(isn_T *iptr)
+{
+    source_cookie_T cookie;
+
+    SOURCING_LNUM = iptr->isn_lnum;
+    // Pass getsourceline to get an error for a missing ":end"
+    // command.
+    CLEAR_FIELD(cookie);
+    cookie.sourcing_lnum = iptr->isn_lnum - 1;
+    if (do_cmdline(iptr->isn_arg.string,
+		getsourceline, &cookie,
+			     DOCMD_VERBOSE|DOCMD_NOWAIT|DOCMD_KEYTYPED) == FAIL
+		|| did_emsg)
+	return FAIL;
+    return OK;
+}
+
 // used for v_instr of typval of VAR_INSTR
 struct instr_S {
     ectx_T	*instr_ectx;
@@ -1637,21 +1658,8 @@
 	{
 	    // execute Ex command line
 	    case ISN_EXEC:
-		{
-		    source_cookie_T cookie;
-
-		    SOURCING_LNUM = iptr->isn_lnum;
-		    // Pass getsourceline to get an error for a missing ":end"
-		    // command.
-		    CLEAR_FIELD(cookie);
-		    cookie.sourcing_lnum = iptr->isn_lnum - 1;
-		    if (do_cmdline(iptr->isn_arg.string,
-				getsourceline, &cookie,
-				   DOCMD_VERBOSE|DOCMD_NOWAIT|DOCMD_KEYTYPED)
-									== FAIL
-				|| did_emsg)
-			goto on_error;
-		}
+		if (exec_command(iptr) == FAIL)
+		    goto on_error;
 		break;
 
 	    // execute Ex command line split at NL characters.
@@ -2880,6 +2888,23 @@
 		vim_unsetenv(iptr->isn_arg.unlet.ul_name);
 		break;
 
+	    case ISN_LOCKUNLOCK:
+		{
+		    typval_T	*lval_root_save = lval_root;
+		    int		res;
+
+		    // Stack has the local variable, argument the whole :lock
+		    // or :unlock command, like ISN_EXEC.
+		    --ectx->ec_stack.ga_len;
+		    lval_root = STACK_TV_BOT(0);
+		    res = exec_command(iptr);
+		    clear_tv(lval_root);
+		    lval_root = lval_root_save;
+		    if (res == FAIL)
+			goto on_error;
+		}
+		break;
+
 	    case ISN_LOCKCONST:
 		item_lock(STACK_TV_BOT(-1), 100, TRUE, TRUE);
 		break;
@@ -5244,6 +5269,9 @@
 	    case ISN_UNLETRANGE:
 		smsg("%s%4d UNLETRANGE", pfx, current);
 		break;
+	    case ISN_LOCKUNLOCK:
+		smsg("%s%4d LOCKUNLOCK %s", pfx, current, iptr->isn_arg.string);
+		break;
 	    case ISN_LOCKCONST:
 		smsg("%s%4d LOCKCONST", pfx, current);
 		break;