diff --git a/kernel/Dockerfile b/kernel/Dockerfile
index 510e82ceb..83d8cd2f4 100644
--- a/kernel/Dockerfile
+++ b/kernel/Dockerfile
@@ -131,11 +131,14 @@ RUN make -j "$(getconf _NPROCESSORS_ONLN)" KCFLAGS="-fno-pie" && \
     ([ -n "${DEBUG}" ] && cp vmlinux /out || true)
 
 # WireGuard
-RUN curl -fsSL -o /wireguard.tar.xz "${WIREGUARD_URL}" && \
-    echo "${WIREGUARD_SHA256}  /wireguard.tar.xz" | sha256sum -c - && \
-    cp /wireguard.tar.xz /out/src/ && \
-    tar -C / --one-top-level=wireguard --strip-components=2 -xJf /wireguard.tar.xz "WireGuard-${WIREGUARD_VERSION}/src" && \
-    make -j "$(getconf _NPROCESSORS_ONLN)" M="/wireguard" modules
+RUN set -e && \
+    if [ "$KERNEL_SERIES" != "5.1.x" ]; then \
+        curl -fsSL -o /wireguard.tar.xz "${WIREGUARD_URL}" && \
+        echo "${WIREGUARD_SHA256}  /wireguard.tar.xz" | sha256sum -c - && \
+        cp /wireguard.tar.xz /out/src/ && \
+        tar -C / --one-top-level=wireguard --strip-components=2 -xJf /wireguard.tar.xz "WireGuard-${WIREGUARD_VERSION}/src" && \
+        make -j "$(getconf _NPROCESSORS_ONLN)" M="/wireguard" modules; \
+    fi
 
 # Modules and Device Tree binaries
 RUN make INSTALL_MOD_PATH=/tmp/kernel-modules modules_install && \