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-rw-r--r--third_party/nix/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/default.nix b/third_party/nix/default.nix
index b4f16d02c7ac..c4a30501697f 100644
--- a/third_party/nix/default.nix
+++ b/third_party/nix/default.nix
@@ -21,7 +21,7 @@ let
   # Proto generation in CMake is theoretically possible, but that is
   # very theoretical - this does it in Nix instead.
   protoSrcs = pkgs.runCommand "nix-proto-srcs" {} ''
-    export PROTO_SRCS=${src}/src/proto
+    export PROTO_SRCS=${src + "/src/proto"}
     mkdir -p $out/libproto
     ${pkgs.protobuf}/bin/protoc -I=$PROTO_SRCS \
       --cpp_out=$out/libproto \