diff --git a/DDTest/CMakeLists.txt b/DDTest/CMakeLists.txt
index c090767d5739dc756ded6d16de31c79d964e307a..0d8483f714dc20409f271ad25c42f64bfad2a323 100644
--- a/DDTest/CMakeLists.txt
+++ b/DDTest/CMakeLists.txt
@@ -14,7 +14,7 @@ dd4hep_package(    DDTest
   USES             DDCore DDRec
   OPTIONAL         DDG4
   INCLUDE_DIRS     include
-  INSTALL_INCLUDES include )
+  INSTALL_INCLUDES include/DD4hep )
 
 dd4hep_add_test_reg ( test_example             BUILD_EXEC REGEX_FAIL "TEST_FAILED" )
 dd4hep_add_test_reg ( test_units               BUILD_EXEC REGEX_FAIL "TEST_FAILED"