diff --git a/CMakeLists.txt b/CMakeLists.txt
index 54e2e1ebfbf..3385bfb6d39 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -509,6 +509,7 @@ if(EXECUTORCH_BUILD_FLATC)
                -DCMAKE_BUILD_TYPE=Release
                -DCMAKE_CXX_FLAGS="-DFLATBUFFERS_MAX_ALIGNMENT=${FLATBUFFERS_MAX_ALIGNMENT}"
     INSTALL_COMMAND ""
+    BUILD_BYPRODUCTS <BINARY_DIR>/flatc
   )
   ExternalProject_Get_Property(flatbuffers BINARY_DIR)
   set(FLATC_EXECUTABLE ${BINARY_DIR}/flatc)