diff --git a/tests/strings/vsnprintf.cpp b/tests/strings/vsnprintf.cpp
index 76579c9e5a..7a92b85784 100644
--- a/tests/strings/vsnprintf.cpp
+++ b/tests/strings/vsnprintf.cpp
@@ -463,10 +463,10 @@ void VsnprintfTestCase::WrongFormatStrings()
 
 void VsnprintfTestCase::BigToSmallBuffer()
 {
-    wchar_t bufw[1024], bufw2[16], bufw3[4], bufw4;
     char bufa[1024], bufa2[16], bufa3[4], bufa4;
 
 #if wxUSE_UNICODE
+    wchar_t bufw[1024], bufw2[16], bufw3[4], bufw4;
     Misc(bufw, 1024);
     Misc(bufw2, 16);
     Misc(bufw3, 4);