diff --git a/export/planloader/planloader.cpp b/export/planloader/planloader.cpp
index 6ecf5e2d..14685c53 100644
--- a/export/planloader/planloader.cpp
+++ b/export/planloader/planloader.cpp
@@ -36,10 +36,10 @@ SerializedPlan* load_substrait_plan(const char* filename) {
 
 void free_substrait_plan(SerializedPlan* plan) {
   if (plan->buffer) {
-    delete plan->buffer;
+    delete[] plan->buffer;
   }
   if (plan->errorMessage) {
-    delete plan->errorMessage;
+    delete[] plan->errorMessage;
   }
   delete plan;
 }