diff --git a/c_api/CMakeLists.txt b/c_api/CMakeLists.txt
index 8e322bb72c..a67d0f9ee6 100644
--- a/c_api/CMakeLists.txt
+++ b/c_api/CMakeLists.txt
@@ -15,12 +15,14 @@ set(FAISS_C_SRC
   IndexFlat_c.cpp
   IndexIVFFlat_c.cpp
   IndexIVF_c.cpp
+  IndexIVF_c_ex.cpp
   IndexLSH_c.cpp
   IndexPreTransform_c.cpp
   VectorTransform_c.cpp
   IndexShards_c.cpp
   IndexReplicas_c.cpp
   Index_c.cpp
+  Index_c_ex.cpp
   IndexBinary_c.cpp
   IndexScalarQuantizer_c.cpp
   MetaIndexes_c.cpp