diff --git a/Makefile b/Makefile
index 9eb195df8..ec22a0ded 100644
--- a/Makefile
+++ b/Makefile
@@ -7,6 +7,11 @@ STATIC   := 0
 
 NO_DBG_SYMBOLS := 0
 
+# Enable multi-threading.
+# Warning: Experimental feature!!
+# invidious is not stable when MT is enabled.
+MT := 0
+
 
 FLAGS ?=
 
@@ -19,6 +24,10 @@ ifeq ($(STATIC), 1)
   FLAGS += --static
 endif
 
+ifeq ($(MT), 1)
+  FLAGS += -Dpreview_mt
+endif
+
 
 ifeq ($(NO_DBG_SYMBOLS), 1)
   FLAGS += --no-debug