diff --git a/CMakeLists.txt b/CMakeLists.txt
index c5c24d5..2024d4d 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -73,7 +73,9 @@ set(CROSS_LIBS
 add_subdirectory(extern)
 
 # enable lto
-set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+if (CMAKE_BUILD_TYPE EQUAL "Release")
+    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+endif ()
 
 add_subdirectory(platforms)