diff --git a/Dockerfile b/Dockerfile
index a95f51d..cf6ec86 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,24 +4,12 @@ ARG PB_VERSION=0.29.2
 
 ARG TARGETARCH
 
-# Set ARCH from TARGETARCH (default to amd64)
-# Pocketbase uses "amd64" or "arm64" in their asset names
-ARG ARCH
-RUN if [ -z "$ARCH" ]; then \
-      case "$TARGETARCH" in \
-        amd64) export ARCH=amd64 ;; \
-        arm64) export ARCH=arm64 ;; \
-        *) echo "Unsupported arch: $TARGETARCH" && exit 1 ;; \
-      esac && \
-      echo "Detected ARCH=$ARCH"; \
-    fi
-
 RUN apk add --no-cache \
     unzip \
     ca-certificates
 
 # download and unzip PocketBase x86 64-bit
-ADD https://github.com/pocketbase/pocketbase/releases/download/v${PB_VERSION}/pocketbase_${PB_VERSION}_linux_${ARCH}.zip /tmp/pb.zip
+ADD https://github.com/pocketbase/pocketbase/releases/download/v${PB_VERSION}/pocketbase_${PB_VERSION}_linux_${TARGETARCH}.zip /tmp/pb.zip
 RUN unzip /tmp/pb.zip -d /pb/
 
 # uncomment to copy the local pb_migrations dir into the image