diff --git a/src/common/strvararg.cpp b/src/common/strvararg.cpp
index 32775972bd..e89bdf35b5 100644
--- a/src/common/strvararg.cpp
+++ b/src/common/strvararg.cpp
@@ -373,9 +373,7 @@ private:
     size_t m_nCopied;
 };
 
-
-
-#ifdef __WINDOWS
+#ifdef __WINDOWS__
 
 // on Windows, we should use %s and %c regardless of the build:
 class wxPrintfFormatConverterWchar : public wxFormatConverterBase<wchar_t>