diff --git a/src/cmdexpand.c b/src/cmdexpand.c
index ba31e92..9b6d9aa 100644
--- a/src/cmdexpand.c
+++ b/src/cmdexpand.c
@@ -1557,10 +1557,12 @@
 
 	case CMD_function:
 	case CMD_delfunction:
-	case CMD_disassemble:
 	    xp->xp_context = EXPAND_USER_FUNC;
 	    xp->xp_pattern = arg;
 	    break;
+	case CMD_disassemble:
+	    set_context_in_disassemble_cmd(xp, arg);
+	    break;
 
 	case CMD_echohl:
 	    set_context_in_echohl_cmd(xp, arg);
@@ -2120,6 +2122,7 @@
 	    {EXPAND_USER_VARS, get_user_var_name, FALSE, TRUE},
 	    {EXPAND_FUNCTIONS, get_function_name, FALSE, TRUE},
 	    {EXPAND_USER_FUNC, get_user_func_name, FALSE, TRUE},
+	    {EXPAND_DISASSEMBLE, get_disassemble_argument, FALSE, TRUE},
 	    {EXPAND_EXPRESSION, get_expr_name, FALSE, TRUE},
 # endif
 # ifdef FEAT_MENU