diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7332b23..822a594 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -130,7 +130,7 @@ target_compile_definitions(sdbus-c++-objlib PRIVATE
 target_include_directories(sdbus-c++-objlib PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
                                                    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>)
-if(DEFINED BUILD_SHARED_LIBS)
+if(BUILD_SHARED_LIBS)
-    set_target_properties(sdbus-c++-objlib PROPERTIES POSITION_INDEPENDENT_CODE ${BUILD_SHARED_LIBS})
+    set_target_properties(sdbus-c++-objlib PROPERTIES POSITION_INDEPENDENT_CODE ON)
 endif()
 if(BUILD_LIBSYSTEMD)
     add_dependencies(sdbus-c++-objlib LibsystemdBuildProject)