diff --git a/src/charset.cpp b/src/charset.cpp
index 0051c3da..91206812 100644
--- a/src/charset.cpp
+++ b/src/charset.cpp
@@ -40,7 +40,7 @@ namespace
 	
 	bool has_non_ascii_chars(const char *s)
 	{
-		for (; s; ++s)
+		for (; *s; ++s)
 			if (char_non_ascii(*s))
 				return true;
 		return false;