diff --git a/src/sync3xl.cpp b/src/sync3xl.cpp
index bc2fa94..be9cb1d 100644
--- a/src/sync3xl.cpp
+++ b/src/sync3xl.cpp
@@ -621,8 +621,8 @@ struct Sync3XL : Via<SYNC3_OVERSAMPLE_AMOUNT, SYNC3_OVERSAMPLE_AMOUNT> {
     }
 
     ~Sync3XL() {
-        free(rightExpander.producerMessage);
-        free(rightExpander.consumerMessage);
+        delete rightExpander.producerMessage;
+        delete rightExpander.consumerMessage;
     }   
 };
 
diff --git a/src/sync3xllevels.cpp b/src/sync3xllevels.cpp
index 56fd7b3..0c550b4 100644
--- a/src/sync3xllevels.cpp
+++ b/src/sync3xllevels.cpp
@@ -49,8 +49,8 @@ struct Sync3XLLevels : Module {
     }
 
     ~Sync3XLLevels() {
-        free(leftExpander.producerMessage);
-        free(leftExpander.consumerMessage);
+        delete leftExpander.producerMessage;
+        delete leftExpander.consumerMessage;
     }   
 
     bool expanderAttached = false;