diff --git a/Makefile b/Makefile
index edadde3..f175ff9 100644
--- a/Makefile
+++ b/Makefile
@@ -218,7 +218,7 @@ lint: $(BUILD_DIRS)
 	    --env GO111MODULE=on                                    \
 	    --env GOFLAGS="-mod=vendor"                             \
 	    $(BUILD_IMAGE)                                          \
-	    golangci-lint run --enable $(ADDTL_LINTERS) --deadline=10m --exclude-files="generated.*\.go$\" --exclude-dirs-use-default
+		golangci-lint run --enable $(ADDTL_LINTERS) --deadline=10m --skip-files="generated.*\.go$\" --skip-dirs-use-default
 
 $(BUILD_DIRS):
 	@mkdir -p $@
diff --git a/types.go b/types.go
index 4c48b88..b797843 100644
--- a/types.go
+++ b/types.go
@@ -903,6 +903,7 @@ type MultiselectElement struct {
 	If                            string    `json:"if,omitempty"`
 	OnChange                      string    `json:"onChange,omitempty"`
 	Required                      bool      `json:"required,omitempty"`
+	CustomClass                   string    `json:"customClass,omitempty"`
 }
 
 /*
@@ -976,7 +977,7 @@ type Editor struct {
 }
 
 type AnchorElement struct {
-	CustomClass string    `json:"customClass"`
+	CustomClass string    `json:"customClass,omitempty"`
 	Label       *Label    `json:"label,omitempty"`
 	Type        string    `json:"type"`
 	URL         AnchorURL `json:"url"`