diff --git a/src/common/string.cpp b/src/common/string.cpp
index 7b9e376870..b45a1482a0 100644
--- a/src/common/string.cpp
+++ b/src/common/string.cpp
@@ -133,7 +133,7 @@ extern const wxChar WXDLLEXPORT *wxEmptyString = &g_strEmpty.dummy;
     #endif //compiler
 #endif // no vsnprintf
 
-#if defined(_AIX) || defined(__DJGPP__)
+#if defined(_AIX)
   // AIX has vsnprintf, but there's no prototype in the system headers.
   extern "C" int vsnprintf(char* str, size_t n, const char* format, va_list ap);
 #endif