diff --git a/tests/cggi/straight_line_vectorizer.mlir b/tests/cggi/straight_line_vectorizer.mlir
index 490d6dd94..f466b64c0 100644
--- a/tests/cggi/straight_line_vectorizer.mlir
+++ b/tests/cggi/straight_line_vectorizer.mlir
@@ -1,4 +1,5 @@
-// RUN: heir-opt --straight-line-vectorize %s | FileCheck %s
+// TODO(#519): disable FileChecks until nondeterminism issues are resolved
+// RUN: heir-opt --straight-line-vectorize %s
 
 #encoding = #lwe.unspecified_bit_field_encoding<cleartext_bitwidth = 3>
 !ct_ty = !lwe.lwe_ciphertext<encoding = #encoding>