diff --git a/src/sfizz/Synth.cpp b/src/sfizz/Synth.cpp
index d16e7954..2f8bd9b8 100644
--- a/src/sfizz/Synth.cpp
+++ b/src/sfizz/Synth.cpp
@@ -142,6 +142,7 @@ void sfz::Synth::clear()
     globalOpcodes.clear();
     masterOpcodes.clear();
     groupOpcodes.clear();
+    unknownOpcodes.clear();
 }
 
 void sfz::Synth::handleGlobalOpcodes(const std::vector<Opcode>& members)