1 files changed, 7 insertions, 1 deletions

diff --git a/sway/commands.c b/sway/commands.c
index 173f0f53..7f24f5ab 100644
--- a/sway/commands.c
+++ b/sway/commands.c
@@ -1318,9 +1318,15 @@ static struct cmd_results *cmd_workspace(int argc, char **argv) {
                                 return error;
                         }
                         struct workspace_output *wso = calloc(1, sizeof(struct workspace_output));
-                        sway_log(L_DEBUG, "Assigning workspace %s to output %s", argv[0], argv[2]);
                         wso->workspace = strdup(argv[0]);
                         wso->output = strdup(argv[2]);
+                        int i = -1;
+                        if ((i = list_seq_find(config->workspace_outputs, workspace_output_cmp_workspace, wso)) != -1) {
+                                struct workspace_output *old = config->workspace_outputs->items[i];
+                                free(old); // workspaces can only be assigned to a single output
+                                list_del(config->workspace_outputs, i);
+                        }
+                        sway_log(L_DEBUG, "Assigning workspace %s to output %s", argv[0], argv[2]);
                         list_add(config->workspace_outputs, wso);
                         if (!config->reading) {
                                 // TODO: Move workspace to output. (dont do so when reloading)