diff --git a/runtime/include/sandbox.h b/runtime/include/sandbox.h
index 885cb32..6d3d940 100644
--- a/runtime/include/sandbox.h
+++ b/runtime/include/sandbox.h
@@ -277,7 +277,7 @@ sandbox_summarize_page_allocations(struct sandbox *sandbox)
 
 	FILE *sandbox_page_allocations_log = fopen(sandbox_page_allocations_log_path, "a");
 
-	fprintf(sandbox_page_allocations_log, "%lu,%lu,%s", sandbox->id, sandbox->running_duration,
+	fprintf(sandbox_page_allocations_log, "%lu,%lu,%s,", sandbox->id, sandbox->running_duration,
 	        sandbox_state_stringify(sandbox->state));
 	for (size_t i = 0; i < sandbox->page_allocation_timestamps_size; i++)
 		fprintf(sandbox_page_allocations_log, "%u,", sandbox->page_allocation_timestamps[i]);