diff --git a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/SystemPropertiesSupport.java b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/SystemPropertiesSupport.java
index 1b6a969bc10e..ccfd3d5441ea 100644
--- a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/SystemPropertiesSupport.java
+++ b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/SystemPropertiesSupport.java
@@ -84,6 +84,8 @@ public abstract class SystemPropertiesSupport implements RuntimeSystemProperties
                     "line.separator",
                     "path.separator",
                     "file.separator",
+                    /* Platform Unicode byte order. */
+                    "sun.io.unicode.encoding",
                     /* For our convenience for now. */
                     "file.encoding",
                     "sun.jnu.encoding",