diff --git a/assets/Makefile b/assets/Makefile
index 4d44941..d9cfb0f 100644
--- a/assets/Makefile
+++ b/assets/Makefile
@@ -2,7 +2,7 @@ ASSETS := \
   player_sheets/player_idle_sheet.png \
   player_sheets/player_walk_sheet.png
 
-ASSETS := $(ASSETS:%=$(ASSETS_DIR)/%)
+ASSETS := $(addprefix $(ASSETS_DIR)/,$(ASSETS))
 
 ASSET_BUILDER_DIR = $(ASSETS_DIR)/asset_builder/src