diff --git a/com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/RError.java b/com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/RError.java
index 8568d3de27df49be6b83ef8a33db51acbbaa136e..b21c24f163ecefb467b388fdac4d6a426a0644e7 100644
--- a/com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/RError.java
+++ b/com.oracle.truffle.r.runtime/src/com/oracle/truffle/r/runtime/RError.java
@@ -584,7 +584,7 @@ public final class RError extends RuntimeException {
         NOT_DEBUGGED("argument is not being debugged"),
         ADDING_INVALID_CLASS("adding class \"%s\" to an invalid object"),
         IS_NA_TO_NON_VECTOR("is.na() applied to non-(list or vector) of type '%s'"),
-        NOT_MEANINGFUL_FOR_FACTORS("‘%s’ not meaningful for factors"), // GNUR uses special ‘ and ’
+        NOT_MEANINGFUL_FOR_FACTORS("\u2018%s\u2019 not meaningful for factors"),
         INPUTS_DIFFERENT_LENGTHS("inputs of different lengths"),
         MATRIX_LIKE_REQUIRED("a matrix-like object is required as argument to '%s'"),
         NOT_MEANINGFUL_FOR_ORDERED_FACTORS("'%s' is not meaningful for ordered factors"),