diff --git a/src/main.c b/src/main.c
index bee289f..c7bda86 100644
--- a/src/main.c
+++ b/src/main.c
@@ -995,10 +995,11 @@ leave_span(MD_SPANTYPE type, void *details, void *ctx_)
                         return ERR_PARSER_LEAVE_SPAN;
 
                     char buf[UINT32_FMT + 2];
+                    int e;
                     buf[0] = '(';
-                    section = uint32_fmt(buf + 1, (uint32) section);
-                    buf[1 + section] = ')';
-                    buf[2 + section] = '\0';
+                    e = uint32_fmt(buf + 1, (uint32) section);
+                    buf[1 + e] = ')';
+                    buf[2 + e] = '\0';
 
                     const char *file;
                     for (int i = 0; i < ctx->nb_pages; ++i) {