diff --git a/src/lib/lib.cpp b/src/lib/lib.cpp
index 2fcd833..7a4b1d7 100644
--- a/src/lib/lib.cpp
+++ b/src/lib/lib.cpp
@@ -513,7 +513,10 @@ inline const gchar *offset_index::read_first_on_page_key(glong page_idx)
 {
 	fseek(idxfile, wordoffset[page_idx], SEEK_SET);
 	guint32 page_size=wordoffset[page_idx+1]-wordoffset[page_idx];
-	fread(wordentry_buf, std::min(sizeof(wordentry_buf), page_size), 1, idxfile); //TODO: check returned values, deal with word entry that strlen>255.
+	fread(wordentry_buf,
+	      std::min(sizeof(wordentry_buf), static_cast<size_t>(page_size)),
+	      1, idxfile);
+	//TODO: check returned values, deal with word entry that strlen>255.
 	return wordentry_buf;
 }