diff --git a/build-constraints.yaml b/build-constraints.yaml
index 49d6c9e6..b45456a5 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1152,6 +1152,9 @@ expected-test-failures:
     # Requires locally running services
     - network-anonymous-i2p
 
+    # Tests not reliable on non-Windows systems
+    - nsis
+
 # Haddocks which are expected to fail. Same concept as expected test failures.
 expected-haddock-failures:
     # https://github.com/acw/bytestring-progress/issues/4