diff --git a/Source/Heavy/WASMExporter.h b/Source/Heavy/WASMExporter.h
index 63de3eec2..555e4feb1 100644
--- a/Source/Heavy/WASMExporter.h
+++ b/Source/Heavy/WASMExporter.h
@@ -19,6 +19,8 @@ class WASMExporter : public ExporterBase {
             property->setPreferredHeight(28);
         }
 
+        emsdkPathValue.addListener(this);
+
         panel.addSection("WASM", properties);
     }
 
@@ -43,6 +45,19 @@ class WASMExporter : public ExporterBase {
         emsdkPathValue = tree.getProperty("emsdkPathValue");
     }
 
+    void valueChanged(Value& v) override
+    {
+        ExporterBase::valueChanged(v);
+
+        String const emsdkPath = getValue<String>(emsdkPathValue);
+
+        if (emsdkPath.isNotEmpty()) {
+            exportButton.setEnabled(true);
+        } else {
+            exportButton.setEnabled(false);
+        }
+    }
+
     bool performExport(String pdPatch, String outdir, String name, String copyright, StringArray searchPaths) override
     {
         exportingView->showState(ExportingProgressView::Exporting);