diff --git a/r-notebook/Dockerfile b/r-notebook/Dockerfile
index 58bd48a0..f2ddb1ab 100644
--- a/r-notebook/Dockerfile
+++ b/r-notebook/Dockerfile
@@ -24,7 +24,7 @@ RUN ln -s /bin/tar /bin/gtar
 USER $NB_UID
 
 # R packages
-RUN conda install --quiet --yes -c conda-forge \
+RUN conda install --quiet --yes \
     'r-base=4.0*' \
     'r-caret=6.*' \
     'r-crayon=1.3*' \