diff --git a/compiler/cheaders.v b/compiler/cheaders.v
index 2004f5fcc4..33187c3b04 100644
--- a/compiler/cheaders.v
+++ b/compiler/cheaders.v
@@ -141,7 +141,9 @@ byteptr g_str_buf;
 int load_so(byteptr);
 void reload_so();
 void init_consts();
-
+#ifdef _WIN32
+BOOL isConsole;
+#endif
 '
 
 js_headers = '
diff --git a/compiler/main.v b/compiler/main.v
index 8a16e2d961..af17e109ca 100644
--- a/compiler/main.v
+++ b/compiler/main.v
@@ -402,7 +402,7 @@ fn (v mut V) generate_main() {
 		cgen.genln('void init_consts() {
 #ifdef _WIN32
 DWORD consoleMode;
-BOOL isConsole = GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), &consoleMode);
+isConsole = GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), &consoleMode);
 int mode = isConsole ? _O_U16TEXT : _O_U8TEXT;
 _setmode(_fileno(stdin), mode);
 _setmode(_fileno(stdout), _O_U8TEXT);