diff --git a/overlay.nix b/overlay.nix
index b31e0d9..e5ec0a2 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -138,7 +138,8 @@ let
 
     dummy = callPackage ./bsc/dummy/default.nix { };
 
-    rdma-core = callPackage ./bsc/rdma-core/default.nix { };
+    # Our custom version that lacks the binaries. Disabled by default.
+    #rdma-core = callPackage ./bsc/rdma-core/default.nix { };
 
     clangOmpss2Unwrapped = callPackage ./bsc/llvm-ompss2/clang.nix {
       stdenv = self.llvmPackages_10.stdenv;