diff --git a/tests/Android.bp b/tests/Android.bp
index 42d280b..4477b52 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -286,6 +286,7 @@
         "-Wno-builtin-memcpy-chk-size",
         "-Wno-format-security",
         "-Wno-format-zero-length",
+        "-Wno-fortify-source",
         "-Wno-memset-transposed-args",
         "-Wno-strlcpy-strlcat-size",
         "-Wno-strncat-size",
diff --git a/tests/clang_fortify_tests.cpp b/tests/clang_fortify_tests.cpp
index 1b6b898..6923302 100644
--- a/tests/clang_fortify_tests.cpp
+++ b/tests/clang_fortify_tests.cpp
@@ -36,6 +36,11 @@
 // Similarly, there are a few overload tricks we have to emit errors. Ignore any notes from those.
 // expected-note@* 0+{{candidate function}}
 
+// FIXME(b/138701943): Silence warnings produced by -Wfortify-source since they're expected.
+// expected-warning@* 0+{{will always overflow}}
+// expected-warning@* 0+{{size argument is too large}}
+// expected-note@* 0+{{has been explicitly marked unavailable here}}
+
 #ifndef _FORTIFY_SOURCE
 #error "_FORTIFY_SOURCE must be defined"
 #endif