diff --git a/src/fileformat.proto b/src/fileformat.proto
index 2322ce0..974ee2f 100644
--- a/src/fileformat.proto
+++ b/src/fileformat.proto
@@ -15,6 +15,7 @@
 
 */
 
+option optimize_for = LITE_RUNTIME;
 option java_package = "crosby.binary";
 package OSMPBF;
 
diff --git a/src/osmformat.proto b/src/osmformat.proto
index 44e24f7..25d9e1c 100644
--- a/src/osmformat.proto
+++ b/src/osmformat.proto
@@ -15,6 +15,7 @@
 
 */
 
+option optimize_for = LITE_RUNTIME;
 option java_package = "crosby.binary";
 package OSMPBF;