diff --git a/.dockerignore b/.dockerignore
index ff43d450d..579d86f4c 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,4 +1,5 @@
 ci
+!ci/fix_compiled_proto.py
 cuebot/src/compiled_protobuf
 images
 samples
diff --git a/cueadmin/Dockerfile b/cueadmin/Dockerfile
index dd1359edc..910b9fd5b 100644
--- a/cueadmin/Dockerfile
+++ b/cueadmin/Dockerfile
@@ -24,6 +24,7 @@ RUN python3 -m grpc_tools.protoc \
 
 # Fix imports to work in both Python 2 and 3. See
 # <https://github.com/protocolbuffers/protobuf/issues/1491> for more info.
+COPY ci/fix_compiled_proto.py ./ci/
 RUN python3 ci/fix_compiled_proto.py pycue/opencue/compiled_proto
 
 COPY cueadmin/README.md ./cueadmin/
diff --git a/pycue/Dockerfile b/pycue/Dockerfile
index c61d3cf16..ca6ab9c66 100644
--- a/pycue/Dockerfile
+++ b/pycue/Dockerfile
@@ -25,7 +25,8 @@ RUN python3 -m grpc_tools.protoc \
 
 # Fix imports to work in both Python 2 and 3. See
 # <https://github.com/protocolbuffers/protobuf/issues/1491> for more info.
-RUN python ci/fix_compiled_proto.py pycue/opencue/compiled_proto
+COPY ci/fix_compiled_proto.py ./ci/
+RUN python3 ci/fix_compiled_proto.py pycue/opencue/compiled_proto
 
 COPY VERSION.in VERSIO[N] ./
 RUN test -e VERSION || echo "$(cat VERSION.in)" | tee VERSION
diff --git a/pyoutline/Dockerfile b/pyoutline/Dockerfile
index 6937a5584..8d7cc3015 100644
--- a/pyoutline/Dockerfile
+++ b/pyoutline/Dockerfile
@@ -24,7 +24,8 @@ RUN python3 -m grpc_tools.protoc \
 
 # Fix imports to work in both Python 2 and 3. See
 # <https://github.com/protocolbuffers/protobuf/issues/1491> for more info.
-RUN python ci/fix_compiled_proto.py pycue/opencue/compiled_proto
+COPY ci/fix_compiled_proto.py ./ci/
+RUN python3 ci/fix_compiled_proto.py pycue/opencue/compiled_proto
 
 COPY pyoutline/README.md ./pyoutline/
 COPY pyoutline/setup.py ./pyoutline/
diff --git a/rqd/Dockerfile b/rqd/Dockerfile
index 6847ad10a..939a899d9 100644
--- a/rqd/Dockerfile
+++ b/rqd/Dockerfile
@@ -35,7 +35,8 @@ RUN python3.9 -m grpc_tools.protoc \
 
 # Fix imports to work in both Python 2 and 3. See
 # <https://github.com/protocolbuffers/protobuf/issues/1491> for more info.
-RUN python ci/fix_compiled_proto.py rqd/rqd/compiled_proto
+COPY ci/fix_compiled_proto.py ./ci/
+RUN python3.9 ci/fix_compiled_proto.py rqd/rqd/compiled_proto
 
 COPY VERSION.in VERSIO[N] ./
 RUN test -e VERSION || echo "$(cat VERSION.in)" | tee VERSION