diff --git a/gui.py b/gui.py
index 47c1fb6..c17178e 100644
--- a/gui.py
+++ b/gui.py
@@ -119,7 +119,7 @@ def gui_results(form):
     if form.blocks:
         for block in form.blocks.split(","):
             blocks.append(block.strip())
-        blocks_clause = " AND ({})".format(" OR ".join(["cmm.material LIKE 'minecraft:{}%'".format(b) for b in blocks]))
+        blocks_clause = " AND ({})".format(" OR ".join(["cmm.material LIKE 'minecraft:{}%%'".format(b) for b in blocks]))
 
     worlds_clause = ""
     worlds = [world["id"] for world in form.worlds if world["checked"]]