diff --git a/scripts/build/buildTypesFile.js b/scripts/build/buildTypesFile.js
index af50ee7..7bcb682 100644
--- a/scripts/build/buildTypesFile.js
+++ b/scripts/build/buildTypesFile.js
@@ -33,7 +33,7 @@ function typeTemplate(filenames) {
         icons?: object, attrs?: object, replaceAttr?: string 
     }
     
-    export declare function placeIcons(options?: PlaceIconsOptions);
+    export declare function placeIcons(options?: PlaceIconsOptions): void;
     
     export declare const icons: Icons;
     
@@ -50,4 +50,4 @@ function typeTemplate(filenames) {
 export default function buildTypesFile(outputDir, filenames) {
     emptyFile(outputDir, TYPES_FILENAME);
     writeToFile(outputDir, TYPES_FILENAME, typeTemplate(filenames));
-}
\ No newline at end of file
+}