diff --git a/ui/index.html b/ui/index.html
index bfef5c43..e49a4566 100644
--- a/ui/index.html
+++ b/ui/index.html
@@ -697,7 +697,7 @@ async function makeImage() {
 function createFileName() {
 
     // Most important information is the prompt
-    const underscoreName = promptField.value = promptField.value.replace(/[^a-zA-Z0-9]/g, '_');
+    const underscoreName = promptField.value.replace(/[^a-zA-Z0-9]/g, '_');
     const seed = seedField.value;
     const steps = numInferenceStepsField.value;
     const guidance =  guidanceScaleField.value;