diff --git a/include/sway/config.h b/include/sway/config.h
index 5a303d9f..40710199 100644
--- a/include/sway/config.h
+++ b/include/sway/config.h
@@ -693,8 +693,6 @@ bool apply_output_configs(struct matched_output_config *configs,
 
 void apply_all_output_configs(void);
 
-bool test_output_config(struct output_config *oc, struct sway_output *output);
-
 struct output_config *store_output_config(struct output_config *oc);
 
 struct output_config *find_output_config(struct sway_output *output);
diff --git a/sway/config/output.c b/sway/config/output.c
index 72cbf261..3f1c3126 100644
--- a/sway/config/output.c
+++ b/sway/config/output.c
@@ -568,16 +568,6 @@ static bool finalize_output_config(struct output_config *oc, struct sway_output
 	return true;
 }
 
-bool test_output_config(struct output_config *oc, struct sway_output *output) {
-	if (output == root->fallback_output) {
-		return false;
-	}
-
-	struct wlr_output_state pending = {0};
-	queue_output_config(oc, output, &pending);
-	return wlr_output_test_state(output->wlr_output, &pending);
-}
-
 static void default_output_config(struct output_config *oc,
 		struct wlr_output *wlr_output) {
 	oc->enabled = 1;