diff --git a/turtles/mine.lua b/turtles/mine.lua
index 8191a14..b365d19 100644
--- a/turtles/mine.lua
+++ b/turtles/mine.lua
@@ -228,14 +228,14 @@ end
 function mine_shaft()
     turn_abs(0)
     while depth < SHAFT_DEPTH do
-        if turtle.detect() then
+        while turtle.detect() do
             turtle.dig()
         end
         move_forward()
     end
     turn_abs(2)
     while depth > 0 do
-        if turtle.detect() then
+        while turtle.detect() do
             turtle.dig()
         end
         move_forward()