diff --git a/Meta/WPT.sh b/Meta/WPT.sh
index 093ef6be5d5..6ee97d8d8f8 100755
--- a/Meta/WPT.sh
+++ b/Meta/WPT.sh
@@ -12,13 +12,18 @@ ensure_ladybird_source_dir
 WPT_SOURCE_DIR=${WPT_SOURCE_DIR:-"${LADYBIRD_SOURCE_DIR}/Tests/LibWeb/WPT/wpt"}
 WPT_REPOSITORY_URL=${WPT_REPOSITORY_URL:-"https://github.com/web-platform-tests/wpt.git"}
 
+BUILD_PRESET=${BUILD_PRESET:-default}
+
+BUILD_DIR=$(get_build_dir "$BUILD_PRESET")
+
 default_binary_path() {
     if [ "$(uname -s)" = "Darwin" ]; then
-        echo "${LADYBIRD_SOURCE_DIR}/Build/ladybird/bin/Ladybird.app/Contents/MacOS/"
+        echo "${BUILD_DIR}/bin/Ladybird.app/Contents/MacOS/"
     else
-        echo "${LADYBIRD_SOURCE_DIR}/Build/ladybird/bin/"
+        echo "${BUILD_DIR}/bin/"
     fi
 }
+
 LADYBIRD_BINARY=${LADYBIRD_BINARY:-"$(default_binary_path)/Ladybird"}
 WEBDRIVER_BINARY=${WEBDRIVER_BINARY:-"$(default_binary_path)/WebDriver"}
 WPT_PROCESSES=${WPT_PROCESSES:-$(get_number_of_processing_units)}
diff --git a/Meta/ladybird.sh b/Meta/ladybird.sh
index 8f2ed508429..e79c025e20f 100755
--- a/Meta/ladybird.sh
+++ b/Meta/ladybird.sh
@@ -95,18 +95,7 @@ cmd_with_target() {
 
     ensure_ladybird_source_dir
 
-    # Note: Keep in sync with buildDir defaults in CMakePresets.json
-    case "${BUILD_PRESET}" in
-        "default")
-            BUILD_DIR="${LADYBIRD_SOURCE_DIR}/Build/ladybird"
-            ;;
-        "Debug")
-            BUILD_DIR="${LADYBIRD_SOURCE_DIR}/Build/ladybird-debug"
-            ;;
-        "Sanitizer")
-            BUILD_DIR="${LADYBIRD_SOURCE_DIR}/Build/ladybird-sanitizers"
-            ;;
-    esac
+    BUILD_DIR=$(get_build_dir "$BUILD_PRESET")
 
     CMAKE_ARGS+=("-DCMAKE_INSTALL_PREFIX=$LADYBIRD_SOURCE_DIR/Build/ladybird-install-${BUILD_PRESET}")
 
diff --git a/Meta/shell_include.sh b/Meta/shell_include.sh
index b73d48b30bb..864d8c5d143 100644
--- a/Meta/shell_include.sh
+++ b/Meta/shell_include.sh
@@ -60,3 +60,26 @@ ensure_ladybird_source_dir() {
         export LADYBIRD_SOURCE_DIR
     fi
 }
+
+get_build_dir() {
+    ensure_ladybird_source_dir
+
+    # Note: Keep in sync with buildDir defaults in CMakePresets.json
+    case "$1" in
+        "default")
+            BUILD_DIR="${LADYBIRD_SOURCE_DIR}/Build/ladybird"
+            ;;
+        "Debug")
+            BUILD_DIR="${LADYBIRD_SOURCE_DIR}/Build/ladybird-debug"
+            ;;
+        "Sanitizer")
+            BUILD_DIR="${LADYBIRD_SOURCE_DIR}/Build/ladybird-sanitizers"
+            ;;
+        *)
+            echo "Unknown BUILD_PRESET: '$1'" >&2
+            exit 1
+            ;;
+    esac
+
+    echo "${BUILD_DIR}"
+}