diff --git a/contrib/build-linux/appimage/build.sh b/contrib/build-linux/appimage/build.sh
index 8c1bfd7f5..c16b19f95 100755
--- a/contrib/build-linux/appimage/build.sh
+++ b/contrib/build-linux/appimage/build.sh
@@ -13,10 +13,6 @@ CONTRIB_APPIMAGE="$CONTRIB/build-linux/appimage"
 DISTDIR="$PROJECT_ROOT/dist"
 BUILD_UID=$(/usr/bin/stat -c %u "$PROJECT_ROOT")
 
-# when bumping the runtime commit also check if the `type2-runtime-reproducible-build.patch` still works
-TYPE2_RUNTIME_COMMIT="5e7217b7cfeecee1491c2d251e355c3cf8ba6e4d"
-TYPE2_RUNTIME_REPO="https://github.com/AppImage/type2-runtime.git"
-
 . "$CONTRIB"/build_tools_util.sh
 
 
@@ -52,29 +48,7 @@ fi
 
 # build the type2-runtime binary, this build step uses a separate docker container
 # defined in the type2-runtime repo (patched with type2-runtime-reproducible-build.patch)
-TYPE2_RUNTIME_REPO_DIR="$PROJECT_ROOT_OR_FRESHCLONE_ROOT/contrib/build-linux/appimage/.cache/appimage/type2-runtime"
-(
-    if [ -f "$TYPE2_RUNTIME_REPO_DIR/runtime-x86_64" ]; then
-        info "type2-runtime already built, skipping"
-        exit 0
-    fi
-    clone_or_update_repo "$TYPE2_RUNTIME_REPO" "$TYPE2_RUNTIME_COMMIT" "$TYPE2_RUNTIME_REPO_DIR"
-
-    # Apply patch to make runtime build reproducible
-    info "Applying type2-runtime patch..."
-    cd "$TYPE2_RUNTIME_REPO_DIR"
-    git apply "$CONTRIB_APPIMAGE/patches/type2-runtime-reproducible-build.patch" || fail "Failed to apply runtime repo patch"
-
-    info "building type2-runtime in build container..."
-    cd "$TYPE2_RUNTIME_REPO_DIR/scripts/docker"
-    env ARCH=x86_64 ./build-with-docker.sh
-    mv "./runtime-x86_64" "$TYPE2_RUNTIME_REPO_DIR/"
-
-    # clean up the empty created 'out' dir to prevent permission issues
-    rm -rf "$TYPE2_RUNTIME_REPO_DIR/out"
-
-    info "runtime build successful: $(sha256sum "$TYPE2_RUNTIME_REPO_DIR/runtime-x86_64")"
-)
+"$CONTRIB_APPIMAGE/make_type2_runtime.sh" || fail "Error building type2-runtime."
 
 info "building binary..."
 # check uid and maybe chown. see #8261
diff --git a/contrib/build-linux/appimage/make_type2_runtime.sh b/contrib/build-linux/appimage/make_type2_runtime.sh
new file mode 100755
index 000000000..fdf751303
--- /dev/null
+++ b/contrib/build-linux/appimage/make_type2_runtime.sh
@@ -0,0 +1,37 @@
+#!/bin/bash
+
+set -e
+
+PROJECT_ROOT="$(dirname "$(readlink -e "$0")")/../../.."
+PROJECT_ROOT_OR_FRESHCLONE_ROOT="$PROJECT_ROOT"
+CONTRIB="$PROJECT_ROOT/contrib"
+CONTRIB_APPIMAGE="$CONTRIB/build-linux/appimage"
+
+# when bumping the runtime commit also check if the `type2-runtime-reproducible-build.patch` still works
+TYPE2_RUNTIME_COMMIT="5e7217b7cfeecee1491c2d251e355c3cf8ba6e4d"
+TYPE2_RUNTIME_REPO="https://github.com/AppImage/type2-runtime.git"
+
+. "$CONTRIB"/build_tools_util.sh
+
+
+TYPE2_RUNTIME_REPO_DIR="$PROJECT_ROOT_OR_FRESHCLONE_ROOT/contrib/build-linux/appimage/.cache/appimage/type2-runtime"
+if [ -f "$TYPE2_RUNTIME_REPO_DIR/runtime-x86_64" ]; then
+    info "type2-runtime already built, skipping"
+    exit 0
+fi
+clone_or_update_repo "$TYPE2_RUNTIME_REPO" "$TYPE2_RUNTIME_COMMIT" "$TYPE2_RUNTIME_REPO_DIR"
+
+# Apply patch to make runtime build reproducible
+info "Applying type2-runtime patch..."
+cd "$TYPE2_RUNTIME_REPO_DIR"
+git apply "$CONTRIB_APPIMAGE/patches/type2-runtime-reproducible-build.patch" || fail "Failed to apply runtime repo patch"
+
+info "building type2-runtime in build container..."
+cd "$TYPE2_RUNTIME_REPO_DIR/scripts/docker"
+env ARCH=x86_64 ./build-with-docker.sh
+mv "./runtime-x86_64" "$TYPE2_RUNTIME_REPO_DIR/"
+
+# clean up the empty created 'out' dir to prevent permission issues
+rm -rf "$TYPE2_RUNTIME_REPO_DIR/out"
+
+info "runtime build successful: $(sha256sum "$TYPE2_RUNTIME_REPO_DIR/runtime-x86_64")"