diff --git a/src/ue4docker/dockerfiles/ue4-build-prerequisites/linux/Dockerfile b/src/ue4docker/dockerfiles/ue4-build-prerequisites/linux/Dockerfile
index d4dba0af..faeca470 100644
--- a/src/ue4docker/dockerfiles/ue4-build-prerequisites/linux/Dockerfile
+++ b/src/ue4docker/dockerfiles/ue4-build-prerequisites/linux/Dockerfile
@@ -1,5 +1,5 @@
 ARG BASEIMAGE
-FROM ${BASEIMAGE} as prerequisites
+FROM ${BASEIMAGE} AS prerequisites
 
 {% if not disable_labels %}
 # Add a sentinel label so we can easily identify all derived images, including intermediate images
@@ -11,15 +11,15 @@ ENV DEBIAN_FRONTEND=noninteractive
 
 # Enable CUDA support for NVIDIA GPUs (even when not using a CUDA base image), since evidently some versions of UE unconditionally assume
 # `libcuda.so.1` exists when using the NVIDIA proprietary drivers, and will fail to initialise the Vulkan RHI if it is missing
-ENV NVIDIA_DRIVER_CAPABILITIES ${NVIDIA_DRIVER_CAPABILITIES},compute
+ENV NVIDIA_DRIVER_CAPABILITIES=${NVIDIA_DRIVER_CAPABILITIES},compute
 
 # Add the "display" driver capability for NVIDIA GPUs
 # (This allows us to run the Editor from an interactive container by bind-mounting the host system's X11 socket)
-ENV NVIDIA_DRIVER_CAPABILITIES ${NVIDIA_DRIVER_CAPABILITIES},display
+ENV NVIDIA_DRIVER_CAPABILITIES=${NVIDIA_DRIVER_CAPABILITIES},display
 
 # Enable NVENC support for use by Unreal Engine plugins that depend on it (e.g. Pixel Streaming)
 # (Note that adding `video` seems to implicitly enable `compute` as well, but we include separate directives here to clearly indicate the purpose of both)
-ENV NVIDIA_DRIVER_CAPABILITIES ${NVIDIA_DRIVER_CAPABILITIES},video
+ENV NVIDIA_DRIVER_CAPABILITIES=${NVIDIA_DRIVER_CAPABILITIES},video
 
 # Install our build prerequisites
 RUN apt-get update && apt-get install -y --no-install-recommends \
diff --git a/src/ue4docker/dockerfiles/ue4-build-prerequisites/windows/Dockerfile b/src/ue4docker/dockerfiles/ue4-build-prerequisites/windows/Dockerfile
index 280c044a..16b23050 100644
--- a/src/ue4docker/dockerfiles/ue4-build-prerequisites/windows/Dockerfile
+++ b/src/ue4docker/dockerfiles/ue4-build-prerequisites/windows/Dockerfile
@@ -2,9 +2,9 @@
 ARG BASEIMAGE
 ARG DLLSRCIMAGE
 
-FROM ${DLLSRCIMAGE} as dlls
+FROM ${DLLSRCIMAGE} AS dlls
 
-FROM ${BASEIMAGE} as deduplication
+FROM ${BASEIMAGE} AS deduplication
 SHELL ["cmd", "/S", "/C"]
 
 {% if not disable_labels %}
@@ -43,7 +43,7 @@ COPY remove-duplicate-dlls.ps1 C:\remove-duplicate-dlls.ps1
 RUN powershell -ExecutionPolicy Bypass -File C:\remove-duplicate-dlls.ps1
 
 # Copy the DLL files into a clean image
-FROM ${BASEIMAGE} as prerequisites
+FROM ${BASEIMAGE} AS prerequisites
 SHELL ["cmd", "/S", "/C"]
 COPY --from=deduplication C:\GatheredDlls\ C:\Windows\System32\
 
diff --git a/src/ue4docker/dockerfiles/ue4-full/linux/Dockerfile b/src/ue4docker/dockerfiles/ue4-full/linux/Dockerfile
index 368bdfea..b8da8539 100644
--- a/src/ue4docker/dockerfiles/ue4-full/linux/Dockerfile
+++ b/src/ue4docker/dockerfiles/ue4-full/linux/Dockerfile
@@ -42,7 +42,7 @@ USER ue4
 
 # Explicitly set the configuration directory for ue4cli
 # (This prevents things from breaking when using CI/CD systems that override the $HOME environment variable)
-ENV UE4CLI_CONFIG_DIR /home/ue4/.config/ue4cli
+ENV UE4CLI_CONFIG_DIR=/home/ue4/.config/ue4cli
 
 # Copy the Conan configuration settings and package cache from the previous build stage
 COPY --from=conan --chown=ue4:ue4 /home/ue4/.conan /home/ue4/.conan
diff --git a/src/ue4docker/dockerfiles/ue4-full/windows/Dockerfile b/src/ue4docker/dockerfiles/ue4-full/windows/Dockerfile
index b30da1b4..2ce2b834 100644
--- a/src/ue4docker/dockerfiles/ue4-full/windows/Dockerfile
+++ b/src/ue4docker/dockerfiles/ue4-full/windows/Dockerfile
@@ -40,7 +40,7 @@ RUN pip install "%CONAN_VERSION%" "%UE4CLI_VERSION%" "%CONAN_UE4CLI_VERSION%" ue
 
 # Explicitly set the configuration directory for ue4cli
 # (This prevents things from breaking when using CI/CD systems that override the $HOME environment variable)
-ENV UE4CLI_CONFIG_DIR C:\Users\ContainerAdministrator\AppData\Roaming\ue4cli
+ENV UE4CLI_CONFIG_DIR=C:\Users\ContainerAdministrator\AppData\Roaming\ue4cli
 
 # Copy the Conan configuration settings and package cache from the previous build stage
 COPY --from=conan C:\Users\ContainerAdministrator\.conan C:\Users\ContainerAdministrator\.conan