diff --git a/cmake/EDM4HEPCPack.cmake b/cmake/EDM4HEPCPack.cmake
index fab2e2320..fda87e7eb 100644
--- a/cmake/EDM4HEPCPack.cmake
+++ b/cmake/EDM4HEPCPack.cmake
@@ -16,9 +16,9 @@ set(CPACK_DEBIAN_PACKAGE_MAINTAINER "valentin.volkl@cern.ch")
 set(CPACK_DEBIAN_PACKAGE_HOMEPAGE ${CPACK_PACKAGE_HOMEPAGE_URL})
 set(CPACK_DEBIAN_PACKAGE_RECOMMENDS "hep-root, hep-podio")
 
-set(CPACK_PACKAGE_DESCRIPTION_FILE "${CMAKE_SOURCE_DIR}/README.md")
-set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_SOURCE_DIR}/LICENSE")
-set(CPACK_RESOURCE_FILE_README "${CMAKE_SOURCE_DIR}/README.md")
+set(CPACK_PACKAGE_DESCRIPTION_FILE "${PROJECT_SOURCE_DIR}/README.md")
+set(CPACK_RESOURCE_FILE_LICENSE "${PROJECT_SOURCE_DIR}/LICENSE")
+set(CPACK_RESOURCE_FILE_README "${PROJECT_SOURCE_DIR}/README.md")
 
 #--- source package settings ---------------------------------------------------
 set(CPACK_SOURCE_IGNORE_FILES
diff --git a/doc/Doxyfile.in b/doc/Doxyfile.in
index 4b2a51e2e..a9f5bd055 100644
--- a/doc/Doxyfile.in
+++ b/doc/Doxyfile.in
@@ -144,7 +144,7 @@ FULL_PATH_NAMES        = YES
 # will be relative from the directory where doxygen is started.
 # This tag requires that the tag FULL_PATH_NAMES is set to YES.
 
-STRIP_FROM_PATH        = @CMAKE_SOURCE_DIR@ @CMAKE_BINARY_DIR@
+STRIP_FROM_PATH        = @PROJECT_SOURCE_DIR@ @CMAKE_BINARY_DIR@
 
 # The STRIP_FROM_INC_PATH tag can be used to strip a user-defined part of the
 # path mentioned in the documentation of a class, which tells the reader which
@@ -743,7 +743,7 @@ WARN_LOGFILE           = @CMAKE_BINARY_DIR@/doxygen-warnings.log
 # spaces.
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = @CMAKE_SOURCE_DIR@
+INPUT                  = @PROJECT_SOURCE_DIR@
 INPUT                 += @CMAKE_BINARY_DIR@/include
 INPUT                 += @CMAKE_CURRENT_BINARY_DIR@
 
@@ -818,7 +818,7 @@ EXCLUDE_SYMBOLS        =
 # that contain example code fragments that are included (see the \include
 # command).
 
-EXAMPLE_PATH           = @CMAKE_SOURCE_DIR@
+EXAMPLE_PATH           = @PROJECT_SOURCE_DIR@
 
 # If the value of the EXAMPLE_PATH tag contains directories, you can use the
 # EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp and
@@ -838,7 +838,7 @@ EXAMPLE_RECURSIVE      = NO
 # that contain images that are to be included in the documentation (see the
 # \image command).
 
-IMAGE_PATH             = @CMAKE_SOURCE_DIR@
+IMAGE_PATH             = @PROJECT_SOURCE_DIR@
 
 # The INPUT_FILTER tag can be used to specify a program that doxygen should
 # invoke to filter for each input file. Doxygen will invoke the filter program
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index e66b57062..1ee3c3c41 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -13,13 +13,13 @@ function(set_test_env _testname)
 endfunction()
 
 add_executable(write_events write_events.cc)
-target_include_directories(write_events PUBLIC ${CMAKE_SOURCE_DIR}/edm4hep )
+target_include_directories(write_events PUBLIC ${PROJECT_SOURCE_DIR}/edm4hep )
 target_link_libraries(write_events edm4hep podio::podioRootIO)
 add_test(NAME write_events COMMAND write_events)
 set_test_env(write_events)
 
 add_executable(read_events read_events.cc)
-target_include_directories(read_events PUBLIC ${CMAKE_SOURCE_DIR}/edm4hep )
+target_include_directories(read_events PUBLIC ${PROJECT_SOURCE_DIR}/edm4hep )
 target_link_libraries(read_events edm4hep podio::podioRootIO)
 add_test(NAME read_events COMMAND read_events)
   set_property(TEST read_events PROPERTY
@@ -29,13 +29,13 @@ set_test_env(read_events)
 
 IF(TARGET edm4hepSioBlocks)
   add_executable(write_events_sio write_events_sio.cc)
-  target_include_directories(write_events_sio PUBLIC ${CMAKE_SOURCE_DIR}/edm4hep)
+  target_include_directories(write_events_sio PUBLIC ${PROJECT_SOURCE_DIR}/edm4hep)
   target_link_libraries(write_events_sio edm4hep podio::podioSioIO)
   add_test(NAME write_events_sio COMMAND write_events_sio)
   set_test_env(write_events_sio)
 
   add_executable(read_events_sio read_events_sio.cc)
-  target_include_directories(read_events_sio PUBLIC ${CMAKE_SOURCE_DIR}/edm4hep)
+  target_include_directories(read_events_sio PUBLIC ${PROJECT_SOURCE_DIR}/edm4hep)
   target_link_libraries(read_events_sio edm4hep podio::podioSioIO)
   add_test(NAME read_events_sio COMMAND read_events_sio)
   set_test_env(read_events_sio)
@@ -46,7 +46,7 @@ ENDIF()
 
 IF(TARGET ROOT::ROOTDataFrame)
   add_executable(test_rdf test_rdf.cc)
-  target_include_directories(test_rdf PUBLIC ${CMAKE_SOURCE_DIR}/edm4hep ${CMAKE_SOURCE_DIR}/dataframe )
+  target_include_directories(test_rdf PUBLIC ${PROJECT_SOURCE_DIR}/edm4hep ${PROJECT_SOURCE_DIR}/dataframe )
   target_link_libraries(test_rdf edm4hepRDF ROOT::ROOTDataFrame podio::podioRootIO)
   add_test(NAME test_rdf COMMAND test_rdf)
   set_test_env(test_rdf)
@@ -59,7 +59,7 @@ IF(TARGET ROOT::ROOTDataFrame)
   get_property(ENVIRONMENT TEST py_test_rdf PROPERTY ENVIRONMENT)
   set_property(TEST py_test_rdf PROPERTY ENVIRONMENT
       ${ENVIRONMENT}
-      PYTHONPATH=${CMAKE_SOURCE_DIR}/python:$ENV{PYTHONPATH}
+      PYTHONPATH=${PROJECT_SOURCE_DIR}/python:$ENV{PYTHONPATH}
   )
   set_tests_properties(py_test_rdf PROPERTIES DEPENDS write_events)
 endif()
diff --git a/test/utils/CMakeLists.txt b/test/utils/CMakeLists.txt
index 1ee1cad3f..e6190b5ae 100644
--- a/test/utils/CMakeLists.txt
+++ b/test/utils/CMakeLists.txt
@@ -24,6 +24,6 @@ add_test(NAME pyunittests COMMAND python -m unittest discover -s ${CMAKE_CURRENT
 set_property(TEST pyunittests
   PROPERTY ENVIRONMENT
   LD_LIBRARY_PATH=$<TARGET_FILE_DIR:edm4hep>:$<TARGET_FILE_DIR:podio::podio>:$<$<TARGET_EXISTS:edm4hepRDF>:$<TARGET_FILE_DIR:edm4hepRDF>:>$<TARGET_FILE_DIR:ROOT::Core>:$ENV{LD_LIBRARY_PATH}
-  PYTHONPATH=${CMAKE_SOURCE_DIR}/python:$ENV{PYTHONPATH}
+  PYTHONPATH=${PROJECT_SOURCE_DIR}/python:$ENV{PYTHONPATH}
   ROOT_INCLUDE_PATH=${PROJECT_SOURCE_DIR}/edm4hep:${PROJECT_SOURCE_DIR}/utils/include:$ENV{ROOT_INCLUDE_PATH}
   )