diff --git a/plugins/lua/buildingplan/pens.lua b/plugins/lua/buildingplan/pens.lua
index 52db6c893..30ce478d8 100644
--- a/plugins/lua/buildingplan/pens.lua
+++ b/plugins/lua/buildingplan/pens.lua
@@ -19,17 +19,17 @@ function reload_pens()
     GOOD_TILE_PEN = to_pen{ch='o', fg=COLOR_GREEN, tile=dfhack.screen.findGraphicsTile('CURSORS', 1, 2)}
     BAD_TILE_PEN = to_pen{ch='X', fg=COLOR_RED, tile=dfhack.screen.findGraphicsTile('CURSORS', 3, 0)}
 
-    local tb = "hack/data/art/border-thin.png"
+    local tb = 'hack/data/art/border-thin.png'
     VERT_TOP_PEN = to_pen { tile = tp(tb, 10), ch = 194, fg = COLOR_GREY, bg = COLOR_BLACK }
     VERT_MID_PEN = to_pen { tile = tp(tb, 4), ch = 179, fg = COLOR_GREY, bg = COLOR_BLACK }
     VERT_BOT_PEN = to_pen { tile = tp(tb, 11), ch = 193, fg = COLOR_GREY, bg = COLOR_BLACK }
 
-    local mb = "hack/data/art/border-medium.png"
+    local mb = 'hack/data/art/border-medium.png'
     HORI_LEFT_PEN = to_pen { tile = tp(mb, 12), ch = 195, fg = COLOR_GREY, bg = COLOR_BLACK }
     HORI_MID_PEN = to_pen { tile = tp(mb, 5), ch = 196, fg = COLOR_GREY, bg = COLOR_BLACK }
     HORI_RIGHT_PEN = to_pen { tile = tp(mb, 13), ch = 180, fg = COLOR_GREY, bg = COLOR_BLACK }
 
-    local cp = "hack/data/art/control-panel.png"
+    local cp = 'hack/data/art/control-panel.png'
     BUTTON_START_PEN = to_pen { tile = tp(cp, 13), ch = '[', fg = COLOR_YELLOW }
     BUTTON_END_PEN = to_pen { tile = tp(cp, 15), ch = ']', fg = COLOR_YELLOW }
     SELECTED_ITEM_PEN = to_pen { tile = tp(cp, 9), ch = string.char(251), fg = COLOR_YELLOW }
diff --git a/plugins/lua/hotkeys.lua b/plugins/lua/hotkeys.lua
index f58d8322a..e2bef331b 100644
--- a/plugins/lua/hotkeys.lua
+++ b/plugins/lua/hotkeys.lua
@@ -70,7 +70,7 @@ local dscreen = dfhack.screen
 function HotspotMenuWidget:onRenderBody(dc)
     local x, y = dc.x, dc.y
     local tp = function(offset)
-        return dfhack.textures.getAsset("hack/data/art/dfhack.png", offset)
+        return dfhack.textures.getAsset('hack/data/art/dfhack.png', offset)
     end
 
     if tp(0) == -1 then