diff --git a/src/org/joni/ApplyCaseFold.java b/src/org/joni/ApplyCaseFold.java
index ca10da1..77b27fd 100644
--- a/src/org/joni/ApplyCaseFold.java
+++ b/src/org/joni/ApplyCaseFold.java
@@ -53,7 +53,7 @@ public void apply(int from, int[]to, int length, Object o) {
             if (Config.CASE_FOLD_IS_APPLIED_INSIDE_NEGATIVE_CCLASS) {
                 if ((inCC && !cc.isNot()) || (!inCC && cc.isNot())) {
                     if (addFlag) {
-                        if (enc.minLength() > 1 || to[0] >= BitSet.SINGLE_BYTE_SIZE) {
+                        if (enc.minLength() > 1 || to[0] >= BitSet.SINGLE_BYTE_SIZE || enc.codeToMbcLength(to[0]) > 1) {
                             cc.addCodeRange(env, to[0], to[0], false);
                         } else {
                             /* /(?i:[^A-C])/.match("a") ==> fail. */
diff --git a/test/org/joni/test/TestUtf8CaseFoldingLatin1Supplement.java b/test/org/joni/test/TestUtf8CaseFoldingLatin1Supplement.java
new file mode 100644
index 0000000..69796af
--- /dev/null
+++ b/test/org/joni/test/TestUtf8CaseFoldingLatin1Supplement.java
@@ -0,0 +1,56 @@
+/*
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to do
+ * so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package org.joni.test;
+
+import org.jcodings.Encoding;
+import org.jcodings.specific.UTF8Encoding;
+import org.joni.Option;
+import org.joni.Syntax;
+
+public class TestUtf8CaseFoldingLatin1Supplement extends Test {
+
+   @Override
+   public int option() {
+      return Option.DEFAULT;
+   }
+
+   @Override
+   public Encoding encoding() {
+      return UTF8Encoding.INSTANCE;
+   }
+
+   @Override
+   public String testEncoding() {
+      return "utf-8";
+   }
+
+   @Override
+   public Syntax syntax() {
+      return Syntax.Java;
+   }
+
+   @Override
+   public void test() throws InterruptedException {
+      // test ignorecase for Latin-1 Supplement
+      x2s("[\\u00e0-\\u00e5]", "\u00c2", 0, 2, Option.IGNORECASE);
+      x2s("[\\u00e2]", "\u00c2", 0, 2, Option.IGNORECASE);
+      x2s("\\u00e2", "\u00c2", 0, 2, Option.IGNORECASE);
+   }
+}