diff --git a/bin/openapi3/erlang-petstore-client.sh b/bin/openapi3/erlang-petstore-client.sh
new file mode 100755
index 00000000000..e813ad78985
--- /dev/null
+++ b/bin/openapi3/erlang-petstore-client.sh
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+SCRIPT="$0"
+
+while [ -h "$SCRIPT" ] ; do
+  ls=`ls -ld "$SCRIPT"`
+  link=`expr "$ls" : '.*-> \(.*\)$'`
+  if expr "$link" : '/.*' > /dev/null; then
+    SCRIPT="$link"
+  else
+    SCRIPT=`dirname "$SCRIPT"`/"$link"
+  fi
+done
+
+if [ ! -d "${APP_DIR}" ]; then
+  APP_DIR=`dirname "$SCRIPT"`/..
+  APP_DIR=`cd "${APP_DIR}"; pwd`
+fi
+
+executable="./modules/openapi-generator-cli/target/openapi-generator-cli.jar"
+
+if [ ! -f "$executable" ]
+then
+  mvn clean package
+fi
+
+# if you've executed sbt assembly previously it will use that instead.
+export JAVA_OPTS="${JAVA_OPTS} -XX:MaxPermSize=256M -Xmx1024M -DloggerPath=conf/log4j.properties"
+ags="$@ generate -t modules/openapi-generator/src/main/resources/erlang-client -DpackageName=petstore -i modules/openapi-generator/src/test/resources/3_0/petstore.yaml -l erlang-client -o samples/client/petstore/erlang-client"
+
+java $JAVA_OPTS -jar $executable $ags
diff --git a/samples/client/petstore/erlang-client/src/petstore_store_api.erl b/samples/client/petstore/erlang-client/src/petstore_store_api.erl
index 178cd0a2cb2..2e72823d9d9 100644
--- a/samples/client/petstore/erlang-client/src/petstore_store_api.erl
+++ b/samples/client/petstore/erlang-client/src/petstore_store_api.erl
@@ -86,7 +86,7 @@ place_order(Ctx, PetstoreOrder, Optional) ->
     QS = [],
     Headers = [],
     Body1 = PetstoreOrder,
-    ContentTypeHeader = petstore_utils:select_header_content_type([]),
+    ContentTypeHeader = petstore_utils:select_header_content_type([<<"application/json">>]),
     Opts = maps:get(hackney_opts, Optional, []),
 
     petstore_utils:request(Ctx, Method, [?BASE_URL, Path], QS, ContentTypeHeader++Headers, Body1, Opts, Cfg).
diff --git a/samples/client/petstore/erlang-client/src/petstore_user_api.erl b/samples/client/petstore/erlang-client/src/petstore_user_api.erl
index b1f07026be8..45a8a9d7872 100644
--- a/samples/client/petstore/erlang-client/src/petstore_user_api.erl
+++ b/samples/client/petstore/erlang-client/src/petstore_user_api.erl
@@ -27,7 +27,7 @@ create_user(Ctx, PetstoreUser, Optional) ->
     QS = [],
     Headers = [],
     Body1 = PetstoreUser,
-    ContentTypeHeader = petstore_utils:select_header_content_type([]),
+    ContentTypeHeader = petstore_utils:select_header_content_type([<<"application/json">>]),
     Opts = maps:get(hackney_opts, Optional, []),
 
     petstore_utils:request(Ctx, Method, [?BASE_URL, Path], QS, ContentTypeHeader++Headers, Body1, Opts, Cfg).
@@ -48,7 +48,7 @@ create_users_with_array_input(Ctx, PetstoreUserArray, Optional) ->
     QS = [],
     Headers = [],
     Body1 = PetstoreUserArray,
-    ContentTypeHeader = petstore_utils:select_header_content_type([]),
+    ContentTypeHeader = petstore_utils:select_header_content_type([<<"application/json">>]),
     Opts = maps:get(hackney_opts, Optional, []),
 
     petstore_utils:request(Ctx, Method, [?BASE_URL, Path], QS, ContentTypeHeader++Headers, Body1, Opts, Cfg).
@@ -69,7 +69,7 @@ create_users_with_list_input(Ctx, PetstoreUserArray, Optional) ->
     QS = [],
     Headers = [],
     Body1 = PetstoreUserArray,
-    ContentTypeHeader = petstore_utils:select_header_content_type([]),
+    ContentTypeHeader = petstore_utils:select_header_content_type([<<"application/json">>]),
     Opts = maps:get(hackney_opts, Optional, []),
 
     petstore_utils:request(Ctx, Method, [?BASE_URL, Path], QS, ContentTypeHeader++Headers, Body1, Opts, Cfg).
@@ -174,7 +174,7 @@ update_user(Ctx, Username, PetstoreUser, Optional) ->
     QS = [],
     Headers = [],
     Body1 = PetstoreUser,
-    ContentTypeHeader = petstore_utils:select_header_content_type([]),
+    ContentTypeHeader = petstore_utils:select_header_content_type([<<"application/json">>]),
     Opts = maps:get(hackney_opts, Optional, []),
 
     petstore_utils:request(Ctx, Method, [?BASE_URL, Path], QS, ContentTypeHeader++Headers, Body1, Opts, Cfg).