diff --git a/sandboxed_api/sandbox2/CMakeLists.txt b/sandboxed_api/sandbox2/CMakeLists.txt
index a1d2289..e781e60 100644
--- a/sandboxed_api/sandbox2/CMakeLists.txt
+++ b/sandboxed_api/sandbox2/CMakeLists.txt
@@ -309,8 +309,6 @@ target_link_libraries(sandbox2_executor
 add_library(sandbox2_sandbox2 ${SAPI_LIB_TYPE}
   sandbox2.cc
   sandbox2.h
-  stack_trace.cc
-  stack_trace.h
 )
 add_library(sandbox2::sandbox2 ALIAS sandbox2_sandbox2)
 target_link_libraries(sandbox2_sandbox2