diff --git a/src/main/java/edu/harvard/dbmi/avillach/dictionary/concept/model/CategoricalConcept.java b/src/main/java/edu/harvard/dbmi/avillach/dictionary/concept/model/CategoricalConcept.java
index de0cf29..135a43a 100644
--- a/src/main/java/edu/harvard/dbmi/avillach/dictionary/concept/model/CategoricalConcept.java
+++ b/src/main/java/edu/harvard/dbmi/avillach/dictionary/concept/model/CategoricalConcept.java
@@ -42,6 +42,7 @@ public CategoricalConcept(String conceptPath, String dataset) {
     }
 
 
+    @JsonProperty("type")
     @Override
     public ConceptType type() {
         return ConceptType.Categorical;
diff --git a/src/main/java/edu/harvard/dbmi/avillach/dictionary/concept/model/ContinuousConcept.java b/src/main/java/edu/harvard/dbmi/avillach/dictionary/concept/model/ContinuousConcept.java
index 7299d3e..021cb4f 100644
--- a/src/main/java/edu/harvard/dbmi/avillach/dictionary/concept/model/ContinuousConcept.java
+++ b/src/main/java/edu/harvard/dbmi/avillach/dictionary/concept/model/ContinuousConcept.java
@@ -43,6 +43,7 @@ public ContinuousConcept(
         this(conceptPath, name, display, dataset, description, allowFiltering, min, max, studyAcronym, meta, null);
     }
 
+    @JsonProperty("type")
     @Override
     public ConceptType type() {
         return ConceptType.Continuous;
diff --git a/src/test/java/edu/harvard/dbmi/avillach/dictionary/concept/model/ConceptTest.java b/src/test/java/edu/harvard/dbmi/avillach/dictionary/concept/model/ConceptTest.java
index 35ed853..b469338 100644
--- a/src/test/java/edu/harvard/dbmi/avillach/dictionary/concept/model/ConceptTest.java
+++ b/src/test/java/edu/harvard/dbmi/avillach/dictionary/concept/model/ConceptTest.java
@@ -78,7 +78,8 @@ void shouldIncludeTypeInList() throws JsonProcessingException {
 
         String actual = new ObjectMapper().writeValueAsString(concepts);
         String expected =
-            "[{\"conceptPath\":\"/foo//baz\",\"name\":\"baz\",\"display\":\"Baz\",\"dataset\":\"study_a\",\"description\":null,\"allowFiltering\":true,\"min\":0.0,\"max\":1.0,\"studyAcronym\":\"\",\"meta\":{},\"children\":null,\"table\":null,\"study\":null},{\"conceptPath\":\"/foo//bar\",\"name\":\"bar\",\"display\":\"Bar\",\"dataset\":\"study_a\",\"description\":null,\"values\":[\"a\",\"b\"],\"allowFiltering\":true,\"studyAcronym\":\"\",\"children\":null,\"meta\":{},\"table\":null,\"study\":null}]";
+            "[{\"conceptPath\":\"/foo//baz\",\"name\":\"baz\",\"display\":\"Baz\",\"dataset\":\"study_a\",\"description\":null,\"allowFiltering\":true,\"min\":0.0,\"max\":1.0,\"studyAcronym\":\"\",\"meta\":{},\"children\":null,\"table\":null,\"study\":null,\"type\":\"Continuous\"},{\"conceptPath\":\"/foo//bar\",\"name\":\"bar\",\"display\":\"Bar\",\"dataset\":\"study_a\",\"description\":null,\"values\":[\"a\",\"b\"],\"allowFiltering\":true,\"studyAcronym\":\"\",\"children\":null,\"meta\":{},\"table\":null,\"study\":null,\"type\":\"Categorical\"}]";
+
         Assertions.assertEquals(expected, actual);
     }
 }