diff --git a/servatrice/CMakeLists.txt b/servatrice/CMakeLists.txt
index 3dbb61b3..1f50bded 100644
--- a/servatrice/CMakeLists.txt
+++ b/servatrice/CMakeLists.txt
@@ -34,6 +34,7 @@ QT4_WRAP_CPP(servatrice_HEADERS_MOC ${servatrice_HEADERS})
 INCLUDE(${QT_USE_FILE})
 INCLUDE_DIRECTORIES(../common)
 INCLUDE_DIRECTORIES(${LIBGCRYPT_INCLUDE_DIR})
+INCLUDE_DIRECTORIES(${PROTOBUF_INCLUDE_DIR})
 INCLUDE_DIRECTORIES(${CMAKE_CURRENT_BINARY_DIR}/../common)
 
 ADD_EXECUTABLE(servatrice ${servatrice_SOURCES} ${servatrice_HEADERS_MOC})