diff --git a/cmake/aurora_si.cmake b/cmake/aurora_si.cmake
index e44961f..76b1f81 100644
--- a/cmake/aurora_si.cmake
+++ b/cmake/aurora_si.cmake
@@ -4,3 +4,4 @@ add_library(aurora::si ALIAS aurora_si)
 
 target_include_directories(aurora_si PUBLIC include)
 target_link_libraries(aurora_si PUBLIC aurora::core)
+target_link_libraries(aurora_si PRIVATE absl::flat_hash_map)