diff --git a/sway/config.c b/sway/config.c
index 14064cde..27308066 100644
--- a/sway/config.c
+++ b/sway/config.c
@@ -756,7 +756,7 @@ void config_update_font_height(bool recalculate) {
 	for (int i = 0; i < root_container.children->length; ++i) {
 		struct sway_container *output = root_container.children->items[i];
 		for (int j = 0; j < output->children->length; ++j) {
-			struct sway_container *ws = output->children->items[i];
+			struct sway_container *ws = output->children->items[j];
 			container_for_each_descendant_dfs(ws->sway_workspace->floating,
 					find_font_height_iterator, &recalculate);
 		}