diff --git a/cmake/compiler.cmake b/cmake/compiler.cmake
index fa32b7b3..5272b2b3 100644
--- a/cmake/compiler.cmake
+++ b/cmake/compiler.cmake
@@ -1,6 +1,7 @@
 
 if( UNIX )
   set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -fPIC" )
+  set( CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -O3")
 else()
   add_definitions( -D_WIN32_WINNT=0x601 )
   add_definitions( -D_CRT_SECURE_NO_WARNINGS )