diff --git a/runtime/Cpp/runtime/CMakeLists.txt b/runtime/Cpp/runtime/CMakeLists.txt
index baf46cac9..2e7756de8 100644
--- a/runtime/Cpp/runtime/CMakeLists.txt
+++ b/runtime/Cpp/runtime/CMakeLists.txt
@@ -134,7 +134,7 @@ set_target_properties(antlr4_static
                                  ARCHIVE_OUTPUT_DIRECTORY ${LIB_OUTPUT_DIR}
                                  COMPILE_FLAGS "${disabled_compile_warnings} ${extra_static_compile_flags}")

-install(TARGETS antlr4_shared
+install(TARGETS antlr4_shared OPTIONAL
         EXPORT antlr4-targets
         ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
         LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}