diff --git a/tools/bit/Android.mk b/tools/bit/Android.mk
index 7f691a0..1c1291f 100644
--- a/tools/bit/Android.mk
+++ b/tools/bit/Android.mk
@@ -22,6 +22,9 @@
 
 LOCAL_MODULE := bit
 
+# This tool doesn't build on darwin.
+LOCAL_MODULE_HOST_OS := linux
+
 LOCAL_SRC_FILES := \
     aapt.cpp \
     adb.cpp \