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--- a/src/utils/utf8iter.h
+++ b/src/utils/utf8iter.h
@@ -103,7 +103,7 @@
 
     /** Append current utf-8 possibly multi-byte character to string param.
 	This needs to be fast. No error checking. */
-    unsigned int appendchartostring(std::string &out) {
+    unsigned int appendchartostring(std::string &out) const {
 #ifdef UTF8ITER_CHECK
 	assert(m_cl != 0);
 #endif