diff --git a/libmamba/include/mamba/core/subdirdata.hpp b/libmamba/include/mamba/core/subdirdata.hpp
index 6432fc0fda..4506b294dc 100644
--- a/libmamba/include/mamba/core/subdirdata.hpp
+++ b/libmamba/include/mamba/core/subdirdata.hpp
@@ -23,11 +23,6 @@
 
 #include "package_handling.hpp"
 
-namespace decompress
-{
-    bool raw(mamba::compression_algorithm ca, const std::string& in, const std::string& out);
-}
-
 namespace mamba
 {
     struct subdir_metadata