diff --git a/.appveyor.yml b/.appveyor.yml
index 1774aba98..e4385102f 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -30,6 +30,7 @@ test_script:
   - build\nimbus.exe --help
   - mingw32-make -j2 ARCH_OVERRIDE=%PLATFORM% test
   - IF "%PLATFORM%" == "x64" mingw32-make -j2 test-reproducibility
+  - mingw32-make -C vendor/nim-beacon-chain -j2 test
 
 deploy: off
 
diff --git a/vendor/nim-beacon-chain b/vendor/nim-beacon-chain
index 02daef60c..59bb4a5a1 160000
--- a/vendor/nim-beacon-chain
+++ b/vendor/nim-beacon-chain
@@ -1 +1 @@
-Subproject commit 02daef60c6e99daba3a9679fe4958fb02b65c62a
+Subproject commit 59bb4a5a185bd0805b6ff558926b0bc5000b10a6