diff --git a/pkgs/development/r-modules/default.nix b/pkgs/development/r-modules/default.nix
index 33d62cd4de67..4da9bf075840 100644
--- a/pkgs/development/r-modules/default.nix
+++ b/pkgs/development/r-modules/default.nix
@@ -372,7 +372,7 @@ let
     EMCluster = [ pkgs.lapack ];
     fangs = [ pkgs.cargo ];
     fastpng = [ pkgs.zlib.dev ];
-    fcl = [ pkgs.cargo ];
+    fcl = with pkgs; [ cargo rustc ];
     fftw = [ pkgs.fftw.dev ];
     fftwtools = with pkgs; [ fftw.dev pkg-config ];
     fingerPro = [ pkgs.gsl ];