diff --git a/src/libpsl-native/CMakeLists.txt b/src/libpsl-native/CMakeLists.txt
index fc26a5b91c..0889042ae1 100644
--- a/src/libpsl-native/CMakeLists.txt
+++ b/src/libpsl-native/CMakeLists.txt
@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 2.8.11)
 project(PSL-NATIVE)
 
 # Can't use add_compile_options with 2.8.11
+set(CMAKE_BUILD_TYPE "Release")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Werror")
 set(LIBRARY_OUTPUT_PATH "${PROJECT_SOURCE_DIR}/../powershell-unix")