diff --git a/src/convert.cpp b/src/convert.cpp
index cd822a89..e92d652c 100644
--- a/src/convert.cpp
+++ b/src/convert.cpp
@@ -1586,7 +1586,7 @@ bool convertStringCharsetIconv(std::string& str, const char* from, const char* t
 #ifdef WINICONV_CONST
   auto inptr = (WINICONV_CONST char*)(str.c_str());
 #else
-  auto inptr = const_cast<char*>(str.c_str());
+  auto inptr = (EXV_ICONV_CONST char*)(str.c_str());
 #endif
   size_t inbytesleft = str.length();
   while (inbytesleft) {