diff --git a/app/Dockerfile b/app/Dockerfile
index bd62ad5..a283542 100644
--- a/app/Dockerfile
+++ b/app/Dockerfile
@@ -33,7 +33,7 @@ COPY --from=base /app .
 
 # Install omopcat package
 # Put package in a subdirectory to avoid overwriting renv files from previous stage
-ADD app ./pkg
+COPY app ./pkg
 RUN R -e 'devtools::install("pkg", dependencies = FALSE)'
 
 EXPOSE 3838
diff --git a/preprocessing/Dockerfile b/preprocessing/Dockerfile
index 93cb7a7..50725be 100644
--- a/preprocessing/Dockerfile
+++ b/preprocessing/Dockerfile
@@ -29,7 +29,7 @@ COPY --from=base /pkg .
 
 # Install omopcat.preprocessing package
 # Put package in a subdirectory to avoid overwriting renv files from previous stage
-ADD preprocessing ./pkg
+COPY preprocessing ./pkg
 RUN R -e 'devtools::install("pkg", dependencies = FALSE)'
 
 CMD ["R", "-e", "omopcat.preprocessing::preprocess()"]