diff --git a/linter/internal/types/stdlib.go b/linter/internal/types/stdlib.go
index 6f0f4a91d..652d0d453 100644
--- a/linter/internal/types/stdlib.go
+++ b/linter/internal/types/stdlib.go
@@ -122,7 +122,7 @@ func prepareStdlib(g *typeGraph) {
 		"manifestPython":       g.newSimpleFuncType(stringType, "v"),
 		"manifestPythonVars":   g.newSimpleFuncType(stringType, "conf"),
 		"manifestTomlEx":       g.newSimpleFuncType(stringType, "value", "indent"),
-		"manifestJsonEx":       g.newSimpleFuncType(stringType, "value", "indent"),
+		"manifestJsonEx":       g.newFuncType(stringType, []ast.Parameter{required("value"), required("indent"), optional("newline"), optional("key_val_sep")}),
 		"manifestJsonMinified": g.newSimpleFuncType(stringType, "value"),
 		"manifestYamlDoc":      g.newFuncType(stringType, []ast.Parameter{required("value"), optional("indent_array_in_object"), optional("quote_keys")}),
 		"manifestYamlStream":   g.newFuncType(anyArrayType, []ast.Parameter{required("value"), optional("indent_array_in_object"), optional("c_document_end"), optional("quote_keys")}),
diff --git a/linter/testdata/stdlib_manifestJsonEx.jsonnet b/linter/testdata/stdlib_manifestJsonEx.jsonnet
new file mode 100644
index 000000000..d98716c08
--- /dev/null
+++ b/linter/testdata/stdlib_manifestJsonEx.jsonnet
@@ -0,0 +1,3 @@
+std.manifestJsonEx({
+  hello: 'world',
+}, 'xxx', '\n', ' ')
diff --git a/linter/testdata/stdlib_manifestJsonEx.linter.golden b/linter/testdata/stdlib_manifestJsonEx.linter.golden
new file mode 100644
index 000000000..e69de29bb