diff --git a/lib/system/threads.nim b/lib/system/threads.nim
index a8a413bcb5bca..0e5198035a04c 100644
--- a/lib/system/threads.nim
+++ b/lib/system/threads.nim
@@ -190,7 +190,7 @@ when defined(windows):
     threadProcWrapperBody(closure)
     # implicitly return 0
 elif defined(genode):
-   proc threadProcWrapper[TArg](closure: pointer) {.noconv.} =
+  proc threadProcWrapper[TArg](closure: pointer) {.noconv.} =
     threadProcWrapperBody(closure)
 else:
   proc threadProcWrapper[TArg](closure: pointer): pointer {.noconv.} =