diff --git a/osmpbf/CMakeLists.txt b/osmpbf/CMakeLists.txt
index 08f2498..46cd483 100644
--- a/osmpbf/CMakeLists.txt
+++ b/osmpbf/CMakeLists.txt
@@ -7,6 +7,7 @@ target_include_directories(osmpbf SYSTEM PUBLIC ${Protobuf_INCLUDE_DIRS})
 install(TARGETS osmpbf ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
 
 protobuf_generate(LANGUAGE cpp
+                  APPEND_PATH
                   TARGET osmpbf
                   PROTOS fileformat.proto osmformat.proto)
 
@@ -21,6 +22,7 @@ set_target_properties(osmpbf_shared PROPERTIES OUTPUT_NAME osmpbf
 install(TARGETS osmpbf_shared LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
 
 protobuf_generate(LANGUAGE cpp
+                  APPEND_PATH
                   TARGET osmpbf_shared
                   PROTOS fileformat.proto osmformat.proto)
 
diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index 7d62dc2..59e04e0 100644
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -8,7 +8,7 @@ add_definitions(-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64)
 
 add_executable(osmpbf-outline osmpbf-outline.cpp)
 
-target_include_directories(osmpbf-outline SYSTEM PRIVATE ${ZLIB_INCLUDE_DIR} ${Protobuf_INCLUDE_DIRS})
+target_include_directories(osmpbf-outline SYSTEM PRIVATE ${ZLIB_INCLUDE_DIR})
 target_link_libraries(osmpbf-outline PRIVATE osmpbf ZLIB::ZLIB)
 set_property(TARGET osmpbf-outline PROPERTY CXX_STANDARD 11)