diff --git a/apps/subgen/Dockerfile b/apps/subgen/Dockerfile
index 2617011..fa1e69b 100644
--- a/apps/subgen/Dockerfile
+++ b/apps/subgen/Dockerfile
@@ -30,11 +30,10 @@ RUN git clone https://github.com/McCloudS/subgen.git . && \
 # git apply fails loudly if a hunk doesn't match — so an upstream
 # rename or refactor will fail the build instead of silently
 # producing a broken image.
-COPY patches/ /tmp/patches/
-RUN for p in /tmp/patches/*.patch; do \
-      echo "Applying $p" && git apply --verbose "$p"; \
-    done && \
-    rm -rf /tmp/patches .git
+COPY patches/01-always-extract-audio-via-ffmpeg.patch /tmp/01-always-extract-audio-via-ffmpeg.patch
+RUN git apply --verbose /tmp/01-always-extract-audio-via-ffmpeg.patch && \
+    rm -f /tmp/01-always-extract-audio-via-ffmpeg.patch && \
+    rm -rf .git
 
 RUN mkdir -p /cache