diff --git a/src/interaction/prothesticLab.tw b/src/interaction/prothesticLab.tw
index 0e22853a2d6217a0f3706fcea1d11536c624c573..8f3cc31836f3ef8695ca00f07a7d5c19e507dd6d 100644
--- a/src/interaction/prothesticLab.tw
+++ b/src/interaction/prothesticLab.tw
@@ -144,7 +144,7 @@ Prosthetic Lab
 			<<case "craftFit">>
 				For @@.yellow;<<= SlaveFullName($slaves[$slaveIndices[$researchLab.tasks[_i].slaveID]])>>@@ you <<if _i == 0>>are constructing<<else>> plan to construct<</if>>
 			<<default>>
-				@@.red;Error: Unknown $$researchLab.tasks[].type: $researchLab.tasks[_i].type@@
+				@@.red;Error: Unknown $researchLab.tasks[].type: $researchLab.tasks[_i].type@@
 			<</switch>>
 			<<set _j += $researchLab.tasks[_i].workLeft>>
 			@@.yellow;<<= capFirstChar(setup.prosthetics[$researchLab.tasks[_i].id].name)>>@@.