diff --git a/src/test/java/com/fasterxml/jackson/failing/CaseInsensitiveDeser953Test.java b/src/test/java/com/fasterxml/jackson/failing/CaseInsensitiveDeser953Test.java
new file mode 100644
index 0000000000..1d77713042
--- /dev/null
+++ b/src/test/java/com/fasterxml/jackson/failing/CaseInsensitiveDeser953Test.java
@@ -0,0 +1,62 @@
+package com.fasterxml.jackson.failing;
+
+import java.util.Locale;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.*;
+
+public class CaseInsensitiveDeser953Test extends BaseMapTest
+{
+    static class Id953 {
+        @JsonProperty("someId")
+        public int someId;
+    }
+
+    private final Locale LOCALE_EN = new Locale("en", "US");
+    
+    private final ObjectMapper INSENSITIVE_MAPPER_EN = jsonMapperBuilder()
+            .enable(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES)
+            .defaultLocale(LOCALE_EN)
+            .build();
+    
+    private final Locale LOCALE_TR = new Locale("tr", "TR");
+
+    private final ObjectMapper INSENSITIVE_MAPPER_TR = jsonMapperBuilder()
+            .enable(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES)
+            .defaultLocale(LOCALE_TR)
+            .build();
+
+    public void testTurkishILetterDeserializationWithEn() throws Exception {
+        _testTurkishILetterDeserialization(INSENSITIVE_MAPPER_EN, LOCALE_EN);
+    }
+
+    public void testTurkishILetterDeserializationWithTr() throws Exception {
+        _testTurkishILetterDeserialization(INSENSITIVE_MAPPER_TR, LOCALE_TR);
+    }
+    
+    private void _testTurkishILetterDeserialization(ObjectMapper mapper, Locale locale) throws Exception
+    {
+        // Sanity check first
+        assertEquals(locale, mapper.getDeserializationConfig().getLocale());
+        
+        final String ORIGINAL_KEY = "someId";
+        
+        Id953 result;
+        result = mapper.readValue("{\""+ORIGINAL_KEY+"\":1}", Id953.class);
+        assertEquals(1, result.someId);
+
+        result = mapper.readValue("{\""+ORIGINAL_KEY.toUpperCase(locale)+"\":1}", Id953.class);
+        assertEquals(1, result.someId);
+
+        result = mapper.readValue("{\""+ORIGINAL_KEY.toLowerCase(locale)+"\":1}", Id953.class);
+        assertEquals(1, result.someId);
+
+        // and finally round-trip too...
+        final Id953 input = new Id953();
+        input.someId = 1;
+        final String json = mapper.writeValueAsString(input);
+
+        result = mapper.readValue(json, Id953.class);
+        assertEquals(1, result.someId);
+    }
+}