diff --git a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/api.mustache b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/api.mustache
index 40f5e2d59e7..7368ed29764 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/api.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/api.mustache
@@ -145,9 +145,7 @@ interface {{classname}} {
     {{^formParams}}
     {{#prioritizedContentTypes}}
     {{#-first}}
-    @Headers({
-        "Content-Type:{{{mediaType}}}"
-    })
+    @Headers("Content-Type:{{{mediaType}}}")
     {{/-first}}
     {{/prioritizedContentTypes}}
     {{/formParams}}