diff --git a/build/autoconf/android.m4 b/build/autoconf/android.m4
index a8f45763a1d6..c61500493056 100644
--- a/build/autoconf/android.m4
+++ b/build/autoconf/android.m4
@@ -259,7 +259,7 @@ MOZ_ARG_WITH_STRING(android-sdk,
                           location where the Android SDK can be found (base directory, e.g. .../android/platforms/android-6)],
     android_sdk=$withval)
 
-android_sdk_root=$withval/../../
+android_sdk_root=${withval%/platforms/android-*}
 
 case "$target" in
 *-android*|*-linuxandroid*)