diff --git a/tcmalloc/BUILD b/tcmalloc/BUILD
index 0dd44b808..93a49f527 100644
--- a/tcmalloc/BUILD
+++ b/tcmalloc/BUILD
@@ -1318,6 +1318,7 @@ cc_test(
     # There can be only one CpuCache due to slab offset caching in rseq.
     malloc = "//tcmalloc/internal:system_malloc",
     shard_count = 3,
+    tags = ["noubsan"],
     deps = [
         ":common_8k_pages",
         ":mock_transfer_cache",
@@ -1344,6 +1345,7 @@ cc_test(
     srcs = ["cpu_cache_activate_test.cc"],
     copts = TCMALLOC_DEFAULT_COPTS,
     malloc = ":tcmalloc_deprecated_perthread",
+    tags = ["noubsan"],
     deps = [
         ":common_deprecated_perthread",
         ":malloc_extension",
diff --git a/tcmalloc/internal/BUILD b/tcmalloc/internal/BUILD
index 96cbb4707..562a43609 100644
--- a/tcmalloc/internal/BUILD
+++ b/tcmalloc/internal/BUILD
@@ -675,6 +675,7 @@ cc_test(
     copts = TCMALLOC_DEFAULT_COPTS,
     linkstatic = 1,
     malloc = ":system_malloc",
+    tags = ["noubsan"],
     deps = [
         ":affinity",
         ":config",
diff --git a/tcmalloc/testing/BUILD b/tcmalloc/testing/BUILD
index 203e1975a..b3f129713 100644
--- a/tcmalloc/testing/BUILD
+++ b/tcmalloc/testing/BUILD
@@ -626,6 +626,7 @@ cc_test(
     linkstatic = 1,
     malloc = "//tcmalloc:tcmalloc_numa_aware",
     tags = [
+        "noubsan",
     ],
     deps = [
         ":testutil",
@@ -808,6 +809,9 @@ cc_test(
     srcs = ["malloc_extension_system_malloc_test.cc"],
     copts = TCMALLOC_DEFAULT_COPTS,
     malloc = "//tcmalloc/internal:system_malloc",
+    tags = [
+        "noubsan",
+    ],
     deps = [
         "//tcmalloc:malloc_extension",
         "@com_google_absl//absl/random",
@@ -926,6 +930,9 @@ cc_test(
     srcs = ["parallel_test.cc"],
     copts = TCMALLOC_DEFAULT_COPTS,
     malloc = "//tcmalloc/internal:system_malloc",
+    tags = [
+        "noubsan",
+    ],
     deps = [
         "//tcmalloc:malloc_extension",
         "//tcmalloc:tcmalloc_internal_methods_only",  # buildcleaner: keep