Fix tdeinit build definition

diff --git a/tdeinit/CMakeLists.txt b/tdeinit/CMakeLists.txt
index e536954..741d600 100644
--- a/tdeinit/CMakeLists.txt
+++ b/tdeinit/CMakeLists.txt
@@ -140,7 +140,11 @@
   DESTINATION ${BIN_INSTALL_DIR}
 )
 
-set_target_properties( ${target} PROPERTIES COMPILE_FLAGS -DEXECUTE=\\"${BIN_INSTALL_DIR}/tdeinit\\" )
+set_property(
+  TARGET ${target}
+  APPEND PROPERTY COMPILE_DEFINITIONS
+  EXECUTE="${BIN_INSTALL_DIR}/tdeinit"
+)
 
 
 #### start_tdeinit_wrapper ######################