diff --git a/CMakeLists.txt b/CMakeLists.txt
index b05eedb7b4..ab7e988aa7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -136,7 +136,7 @@ ign_find_package(IgnProtobuf
                  REQUIRED
                  COMPONENTS all
                  PRETTY Protobuf)
-set(PROTOBUF_IMPORT_DIRS ${ignition-msgs6_INCLUDE_DIRS})
+set(Protobuf_IMPORT_DIRS ${ignition-msgs6_INCLUDE_DIRS})
 
 # Plugin install dirs
 set(IGNITION_GAZEBO_PLUGIN_INSTALL_DIR