diff --git a/modules/swagger-codegen/src/main/resources/clojure/core.mustache b/modules/swagger-codegen/src/main/resources/clojure/core.mustache
index 79d0ee9b5e..0da2a45149 100644
--- a/modules/swagger-codegen/src/main/resources/clojure/core.mustache
+++ b/modules/swagger-codegen/src/main/resources/clojure/core.mustache
@@ -174,7 +174,7 @@
   [mime]
   (if mime
     (or (= :json mime)
-        (re-matches #"application/json(;.*)?" (name mime)))))
+        (re-matches #"(?i)application/json(;.*)?" (name mime)))))
 
 (defn json-preferred-mime
   "Choose a MIME from the given MIMEs with JSON preferred,
diff --git a/samples/client/petstore/clojure/src/swagger_petstore/core.clj b/samples/client/petstore/clojure/src/swagger_petstore/core.clj
index 4c8a842696..665adfbc77 100644
--- a/samples/client/petstore/clojure/src/swagger_petstore/core.clj
+++ b/samples/client/petstore/clojure/src/swagger_petstore/core.clj
@@ -174,7 +174,7 @@
   [mime]
   (if mime
     (or (= :json mime)
-        (re-matches #"application/json(;.*)?" (name mime)))))
+        (re-matches #"(?i)application/json(;.*)?" (name mime)))))
 
 (defn json-preferred-mime
   "Choose a MIME from the given MIMEs with JSON preferred,
diff --git a/samples/client/petstore/clojure/test/swagger_petstore/core_test.clj b/samples/client/petstore/clojure/test/swagger_petstore/core_test.clj
index 27a9e1db29..87ac0a8b73 100644
--- a/samples/client/petstore/clojure/test/swagger_petstore/core_test.clj
+++ b/samples/client/petstore/clojure/test/swagger_petstore/core_test.clj
@@ -151,10 +151,12 @@
     (is (= expected (boolean (json-mime? mime))))
     :json true
     "application/json" true
+    "APPLICATION/JSON" true
     "application/json; charset=utf8" true
     nil false
     :xml false
-    "application/pdf" false))
+    "application/pdf" false
+    "application/jsonp" false))
 
 (deftest test-json-preferred-mime
   (are [mimes expected]
@@ -177,4 +179,4 @@
     "{\"aa\": 1, \"bb\": \"2\"}" "application/json" {:aa 1 :bb "2"}
     "[1, \"2\"]" "application/json; charset=UTF8" [1 "2"]
     "{invalid json}" "application/json" "{invalid json}"
-    "plain text" "text/plain" "plain text"))
\ No newline at end of file
+    "plain text" "text/plain" "plain text"))