diff --git a/leshan-core/src/test/java/org/eclipse/leshan/core/link/DefaultLinkParserTest.java b/leshan-core/src/test/java/org/eclipse/leshan/core/link/DefaultLinkParserTest.java
index e5443e60ba..8237998c41 100644
--- a/leshan-core/src/test/java/org/eclipse/leshan/core/link/DefaultLinkParserTest.java
+++ b/leshan-core/src/test/java/org/eclipse/leshan/core/link/DefaultLinkParserTest.java
@@ -17,6 +17,7 @@
 
 import static org.junit.Assert.assertEquals;
 
+import java.nio.charset.StandardCharsets;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
@@ -120,7 +121,7 @@ public void allow_escaped_characters2c() throws LinkParseException {
 
     @Test
     public void dont_escape_non_ascii_chars() throws LinkParseException {
-        Link[] parsed = parser.parse("</foo>;param=\" \\ą \",</bar>".getBytes());
+        Link[] parsed = parser.parse("</foo>;param=\" \\ą \",</bar>".getBytes(StandardCharsets.UTF_8));
         Assert.assertEquals("/foo", parsed[0].getUriReference());
 
         Map<String, LinkParamValue> attResult = new HashMap<>();
diff --git a/leshan-core/src/test/java/org/eclipse/leshan/core/link/LinkParserValidationTest.java b/leshan-core/src/test/java/org/eclipse/leshan/core/link/LinkParserValidationTest.java
index 3f3a76eb4e..46661e3009 100644
--- a/leshan-core/src/test/java/org/eclipse/leshan/core/link/LinkParserValidationTest.java
+++ b/leshan-core/src/test/java/org/eclipse/leshan/core/link/LinkParserValidationTest.java
@@ -17,6 +17,7 @@
 
 import static org.junit.Assert.assertThrows;
 
+import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.Collection;
 
@@ -75,7 +76,7 @@ public void parse_invalid_formats() {
         assertThrows(LinkParseException.class, new ThrowingRunnable() {
             @Override
             public void run() throws LinkParseException {
-                parser.parse(linkValueList.getBytes());
+                parser.parse(linkValueList.getBytes(StandardCharsets.UTF_8));
             }
         });
     }