diff --git a/Dockerfile.jenkins b/Dockerfile.jenkins
index c81df06..af9ea53 100644
--- a/Dockerfile.jenkins
+++ b/Dockerfile.jenkins
@@ -1,6 +1,6 @@
 FROM debian:trixie
 RUN apt-get update && apt-get install -y \
-    build-essential make docker.io git ca-certificates
+    build-essential make docker.io git ca-certificates libffi-dev
 RUN git clone https://github.com/ashinn/chibi-scheme.git --depth=1
 RUN git clone https://codeberg.org/retropikzel/compile-r7rs.git --depth=1 --branch=silence
 WORKDIR /chibi-scheme