diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7be5820..bfd14ff 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,7 +41,7 @@ target_include_directories(
 
 target_link_libraries(runsim ${PROJECT_NAME})
 
-target_sources(runsim PRIVATE src/main.cc)
+target_sources(runsim PRIVATE src/main.cc src/utils.cc)
 
 # Visualization
 add_executable(vissim)