diff --git a/scripts/postcss/svg-builder.mjs b/scripts/postcss/svg-builder.mjs
index 1bbc4010..ec94f1e5 100644
--- a/scripts/postcss/svg-builder.mjs
+++ b/scripts/postcss/svg-builder.mjs
@@ -17,7 +17,7 @@ limitations under the License.
 import {readFileSync, mkdirSync, writeFileSync} from "fs";
 import {resolve} from "path";
 import {h32} from "xxhashjs";
-import {getColoredSvgString} from "./svg-colorizer.js";
+import {getColoredSvgString} from "./svg-colorizer.mjs";
 
 function createHash(content) {
     const hasher = new h32(0);
diff --git a/scripts/postcss/svg-colorizer.js b/scripts/postcss/svg-colorizer.mjs
similarity index 100%
rename from scripts/postcss/svg-colorizer.js
rename to scripts/postcss/svg-colorizer.mjs
diff --git a/src/platform/web/IconColorizer.ts b/src/platform/web/IconColorizer.ts
index 81644603..8baf63b0 100644
--- a/src/platform/web/IconColorizer.ts
+++ b/src/platform/web/IconColorizer.ts
@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 import type {Platform} from "./Platform.js";
-import {getColoredSvgString} from "../../../scripts/postcss/svg-colorizer.js";
+import {getColoredSvgString} from "../../../scripts/postcss/svg-colorizer.mjs";
 
 type ParsedStructure = {
     [variableName: string]: {