diff --git a/source/modules/jsusfx/source/jsusfx.cpp b/source/modules/jsusfx/source/jsusfx.cpp
index cfb7dea2e..0386da377 100644
--- a/source/modules/jsusfx/source/jsusfx.cpp
+++ b/source/modules/jsusfx/source/jsusfx.cpp
@@ -996,6 +996,7 @@ void JsusFx::prepare(int sampleRate, int blockSize) {
     *srate = (double) sampleRate;
     *samplesblock = blockSize;
     NSEEL_code_execute(codeInit);
+    computeSlider = true;
 }
 
 void JsusFx::moveSlider(int idx, float value, int normalizeSlider) {