diff --git a/tests/fingerprint/Android.bp b/tests/fingerprint/Android.bp
index 7de3dee..9524b7b 100644
--- a/tests/fingerprint/Android.bp
+++ b/tests/fingerprint/Android.bp
@@ -9,6 +9,7 @@
 
     cflags: [
         "-Wall",
+        "-Werror",
         "-Wextra",
     ],
 }
diff --git a/tests/nusensors/Android.bp b/tests/nusensors/Android.bp
index e923468..8b267db 100644
--- a/tests/nusensors/Android.bp
+++ b/tests/nusensors/Android.bp
@@ -3,6 +3,8 @@
 
     srcs: ["nusensors.cpp"],
 
+    cflags: ["-Wall", "-Werror"],
+
     shared_libs: [
         "libcutils",
         "libhardware",