diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -23,7 +23,6 @@ add_files(
     random_func.cpp
     random_func.hpp
     smallmap_type.hpp
-    smallmatrix_type.hpp
     smallstack_type.hpp
     smallvec_type.hpp
     span_type.hpp