diff --git a/Dockerfile b/Dockerfile
index 125974f..77ad601 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -51,10 +51,15 @@ WORKDIR /app
 # Copy project file to list dependencies
 COPY ./src/satosa/pyproject.toml /app/
 
-# Install oidc2fer in editable mode along with development dependencies
-RUN pip install -e .[dev]
+# Create empty module directory to please pip install --editable
+# (without this, the oidc2fer module will not be importable because
+#  pip --editable scans the directory to create its "links")
+RUN mkdir -p /app/oidc2fer
 
-# Copy oidc2fer application (see .dockerignore)
+# Install oidc2fer in editable mode along with development dependencies
+RUN pip install --editable .[dev]
+
+# Copy oidc2fer sources (see .dockerignore)
 COPY ./src/satosa /app/
 
 # Switch to unprivileged user