diff --git a/proguard-1.0.2-SNAPSHOT.conf b/proguard-1.0.2-SNAPSHOT.conf
index f7cf04b58..938e14bb5 100644
--- a/proguard-1.0.2-SNAPSHOT.conf
+++ b/proguard-1.0.2-SNAPSHOT.conf
@@ -55,6 +55,17 @@
 -dontshrink
 -dontoptimize
 
+-keeppackagenames com.nhn.pinpoint.profiler.util.jdk
+
+-keep class com.nhn.pinpoint.profiler.util.jdk.* {
+	*;
+}
+
+# com.nhn.pinpoint.profiler.tools.NetworkAvailabilityChecker
+-keep class * extends com.nhn.pinpoint.profiler.tools.PinpointTools {
+	<methods>;
+}
+
 # com.nhn.pinpoint.profiler.tools.NetworkAvailabilityChecker
 -keep class * extends com.nhn.pinpoint.profiler.tools.PinpointTools {
 	<methods>;