diff --git a/Source/Heavy/OWLExporter.h b/Source/Heavy/OWLExporter.h
index 185ff34f8..f346a253e 100644
--- a/Source/Heavy/OWLExporter.h
+++ b/Source/Heavy/OWLExporter.h
@@ -144,7 +144,7 @@ class OWLExporter : public ExporterBase {
 
             auto OwlDir = outputFile.getChildFile("OwlProgram");
             OwlDir.setAsCurrentWorkingDirectory();
-            OwlDir.getChildFile("Tools/FirmwareSender").setExecutePermission(1);
+            OwlDir.getChildFile("Tools/FirmwareSender" + exeSuffix).setExecutePermission(1);
 
             auto const& gccPath = bin.getFullPathName();