diff --git a/ipa-core/tests/hybrid.rs b/ipa-core/tests/hybrid.rs
index 845bf081a..69f313c11 100644
--- a/ipa-core/tests/hybrid.rs
+++ b/ipa-core/tests/hybrid.rs
@@ -79,6 +79,7 @@ fn test_hybrid() {
     command
         .args(["--network".into(), dir.path().join("network.toml")])
         .args(["--output-file".as_ref(), output_file.as_os_str()])
+        .args(["--shard-count", SHARDS.to_string().as_str()])
         .args(["--wait", "2"])
         .arg("malicious-hybrid")
         .args(["--enc-input-file1".as_ref(), enc1.as_os_str()])