diff --git a/nix/build-all.py b/nix/build-all.py
index 7ffb9af1b2..1fcca500c2 100644
--- a/nix/build-all.py
+++ b/nix/build-all.py
@@ -91,8 +91,8 @@ PCRE_VERSION="8.43"
 LIBXML2_VERSION="2.9.9_2"
 #CMAKE_VERSION="3.4.1"
 CMAKE_VERSION="3.14.5"
-#SWIG_VERSION="3.0.12"
-SWIG_VERSION="4.0.0"
+SWIG_VERSION="3.0.12"
+#SWIG_VERSION="4.0.0"
 #OPENCOLLADA_VERSION="v1.6.63"
 OPENCOLLADA_VERSION="v1.6.68"