diff --git a/cmd/wails/3_build.go b/cmd/wails/3_build.go
index bf3012414..7b5538766 100644
--- a/cmd/wails/3_build.go
+++ b/cmd/wails/3_build.go
@@ -215,7 +215,7 @@ func init() {
 
 		// If we are forcing a rebuild
 		if forceRebuild {
-			buildCommand.Add(" -a")
+			buildCommand.Add("-a")
 		}
 
 		// Release mode
diff --git a/renderer_headless.go b/renderer_headless.go
index 0d5749b04..b348009b1 100644
--- a/renderer_headless.go
+++ b/renderer_headless.go
@@ -126,6 +126,13 @@ func (h *Headless) start(conn *websocket.Conn) {
 		h.injectCSS(h.frameworkCSS)
 	}
 
+	var injectHTML string
+	if h.appConfig.isHTMLFragment {
+		injectHTML = fmt.Sprintf("$('#app').html('%s')", h.appConfig.HTML)
+	}
+
+	h.evalJS(injectHTML)
+
 	// Inject user CSS
 	if h.appConfig.CSS != "" {
 		outputCSS := fmt.Sprintf("%.45s", h.appConfig.CSS)