diff --git a/android/build.xml b/android/build.xml
index 3defd3de7..4d6f0eab6 100644
--- a/android/build.xml
+++ b/android/build.xml
@@ -190,6 +190,7 @@ limitations under the License.
       <arg value="-libraryjars ${android-jar}"/>
       <arg value="-keep class com.google.zxing.client.android.*Activity"/>
       <arg value="-keep class com.google.zxing.client.android.ViewfinderView { public * ; }"/>
+      <arg value="-keep class com.google.zxing.client.android.SearchBookContents* { public * ; }"/>
       <arg value="-target 5"/>
       <arg value="-optimizationpasses 7"/>
       <arg value="-dontshrink"/>