diff --git a/src/ccmain/pagewalk.cpp b/src/ccmain/pagewalk.cpp
index a6dc0548..a02fe5f4 100644
--- a/src/ccmain/pagewalk.cpp
+++ b/src/ccmain/pagewalk.cpp
@@ -28,9 +28,9 @@ namespace tesseract {
  * to each word that overlaps the selection_box.
  */
 void Tesseract::process_selected_words(
-    PAGE_RES* page_res, // blocks to check
-    TBOX & selection_box,
-    BOOL8(tesseract::Tesseract::*word_processor)(PAGE_RES_IT* pr_it)) {
+        PAGE_RES* page_res, // blocks to check
+        TBOX& selection_box,
+        bool (tesseract::Tesseract::* word_processor)(PAGE_RES_IT* pr_it)) {
   for (PAGE_RES_IT page_res_it(page_res); page_res_it.word() != nullptr;
        page_res_it.forward()) {
     WERD* word = page_res_it.word()->word;