diff --git a/src/dump_analysis.cpp b/src/dump_analysis.cpp
index 9cb0f46c9ff3549eb1a5253852e57a33b7062c6a..401fa37ded061718fad0ba49f46076c1b7e8da96 100644
--- a/src/dump_analysis.cpp
+++ b/src/dump_analysis.cpp
@@ -44,7 +44,7 @@ static void jw_nl_indent(JsonWriter *jw) {
     assert(jw->state_index >= 1);
     fprintf(jw->f, "%s", jw->nl);
     for (size_t i = 0; i < jw->state_index - 1; i += 1) {
-        fprintf(jw->f, jw->one_indent);
+        fprintf(jw->f, "%s", jw->one_indent);
     }
 }