diff --git a/libm/Android.mk b/libm/Android.mk
index fb8df07..f6c49aa 100644
--- a/libm/Android.mk
+++ b/libm/Android.mk
@@ -485,6 +485,7 @@
     -D__BIONIC_NO_MATH_INLINES \
     -DFLT_EVAL_METHOD=0 \
     -include $(LOCAL_PATH)/freebsd-compat.h \
+    -Werror \
     -Wno-missing-braces \
     -Wno-parentheses \
     -Wno-sign-compare \