diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6871693..6b5a69b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,7 +27,7 @@ if(NOT DEFINED CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Release)
 endif()
 
-if(NOT (CMAKE_BUILD_TYPE STREQUAL "Debug"))
+if(NOT (CMAKE_BUILD_TYPE STREQUAL "Debug") AND BUILD_SHARED_LIBS)
     set(CMAKE_INTERPROCEDURAL_OPTIMIZATION ON)
 endif()