1 files changed, 1 insertions, 1 deletions
diff --git a/common/nextpnr.h b/common/nextpnr.h
index f391469c..f7f1cebc 100644
--- a/common/nextpnr.h
+++ b/common/nextpnr.h
@@ -392,7 +392,7 @@ struct BaseCtx
 
     void unlock(void)
     {
-        NPNR_ASSERT(std::this_thread::get_id() != mutex_owner);
+        NPNR_ASSERT(std::this_thread::get_id() == mutex_owner);
         mutex.unlock();
     }