diff --git a/src/cpp-flex.skl b/src/cpp-flex.skl
index 1db04465b..1c62e3dce 100644
--- a/src/cpp-flex.skl
+++ b/src/cpp-flex.skl
@@ -2390,7 +2390,7 @@ int yyFlexLexer::LexerInput( char* buf, int max_size )
 	if ( yyin.bad() ) {
 		return -1;
 	} else {
-		return yyin.gcount();
+		return (int)yyin.gcount();
 	}
 #endif
 }