diff --git a/src/pages/detection-mixin.js b/src/pages/detection-mixin.js
index 21b2c02..aad01eb 100644
--- a/src/pages/detection-mixin.js
+++ b/src/pages/detection-mixin.js
@@ -27,10 +27,12 @@ export default {
     async localDetect(imageData) {
       console.time('pre-process')
       const [modelWidth, modelHeight] = model.inputs[0].shape.slice(1, 3)
+      let gTense = null
       const input = tf.tidy(() => {
-        var gTense = tf.image.rgbToGrayscale(tf.image.resizeBilinear(tf.browser.fromPixels(imageData), [modelWidth, modelHeight])).div(255.0).expandDims(0)
+        gTense = tf.image.rgbToGrayscale(tf.image.resizeBilinear(tf.browser.fromPixels(imageData), [modelWidth, modelHeight])).div(255.0).expandDims(0)
         return tf.concat([gTense,gTense,gTense],3)
       })
+      tf.dispose(gTense)
       console.timeEnd('pre-process')
 
       console.time('run prediction')