diff --git a/src/common/filename.cpp b/src/common/filename.cpp
index 5c457be39c..34d8845668 100644
--- a/src/common/filename.cpp
+++ b/src/common/filename.cpp
@@ -2656,17 +2656,18 @@ wxString wxFileName::GetHumanReadableSize(const wxULongLong &bs,
 
     // depending on the convention used the multiplier may be either 1000 or
     // 1024 and the binary infix may be empty (for "KB") or "i" (for "KiB")
-    double multiplier;
+    double multiplier = 1024.;
     wxString biInfix;
 
     switch ( conv )
     {
+        case wxSIZE_CONV_TRADITIONAL:
+            // nothing to do, this corresponds to the default values of both
+            // the multiplier and infix string
+            break;
+
         case wxSIZE_CONV_IEC:
             biInfix = "i";
-            // fall through
-
-        case wxSIZE_CONV_TRADITIONAL:
-            multiplier = 1024.;
             break;
 
         case wxSIZE_CONV_SI: