diff --git a/ortools/gurobi/CMakeLists.txt b/ortools/gurobi/CMakeLists.txt
index 80d17d192a..c0b3456118 100644
--- a/ortools/gurobi/CMakeLists.txt
+++ b/ortools/gurobi/CMakeLists.txt
@@ -11,7 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-file(GLOB _SRCS "*.h" "*.cc")
+file(GLOB_RECURSE _SRCS "*.h" "*.cc")
 set(NAME ${PROJECT_NAME}_gurobi)
 
 # Will be merge in libortools.so