diff --git a/src/of_util.cpp b/src/of_util.cpp
index 2f59154..06bbbc1 100644
--- a/src/of_util.cpp
+++ b/src/of_util.cpp
@@ -100,13 +100,13 @@ ofString OfUtil::get_file_size(long long bytes)
 
     std::ostringstream oss;
     if (gb > 0) {
-        oss << gb << ofT("GB");
+        oss << gb << ofT("G_");
     }
     if (mb > 0 || gb > 0) {
-        oss << mb << ofT("MB");
+        oss << mb << ofT("M_");
     }
     if (kb > 0 || mb > 0 || gb > 0) {
-        oss << kb << ofT("KB");
+        oss << kb << ofT("K");
     }
     return oss.str();
 }