diff --git a/library/build.gradle b/library/build.gradle
index acc4abb..d5273d0 100755
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -19,6 +19,7 @@ android {
       proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
     }
   }
+  namespace 'com.ogaclejapan.smarttablayout'
 }
 
 dependencies {
diff --git a/utils-v4/build.gradle b/utils-v4/build.gradle
index 4acc252..bc28e4e 100755
--- a/utils-v4/build.gradle
+++ b/utils-v4/build.gradle
@@ -18,6 +18,7 @@ android {
       proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
     }
   }
+  namespace 'com.ogaclejapan.smarttablayout.utils'
 }
 
 dependencies {