diff --git a/project.properties b/project.properties
index ea84c575..27f6863f 100644
--- a/project.properties
+++ b/project.properties
@@ -6,7 +6,7 @@
 # To customize properties used by the Ant build system use,
 # "ant.properties", and override values to adapt the script to your
 # project structure.
-proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
+proguard.config=${sdk.dir}/tools/proguard/proguard-android-optimize.txt:proguard-project.txt
 
 # Project target.
 target=android-19