diff --git a/ortools/glpk/CMakeLists.txt b/ortools/glpk/CMakeLists.txt
index dcc7cee82b..940cfcf7ba 100644
--- a/ortools/glpk/CMakeLists.txt
+++ b/ortools/glpk/CMakeLists.txt
@@ -31,5 +31,6 @@ target_include_directories(${NAME} PUBLIC
 target_link_libraries(${NAME} PRIVATE
   absl::strings
   absl::str_format
+  protobuf::libprotobuf
   $<$<BOOL:${USE_GLPK}>:GLPK::GLPK>)
 #add_library(${PROJECT_NAME}::glpk ALIAS ${NAME})