diff --git a/lib/output.c b/lib/output.c
index 54d505d9..e9e58ac8 100644
--- a/lib/output.c
+++ b/lib/output.c
@@ -164,7 +164,7 @@ int mp_add_subcheck_to_subcheck(mp_subcheck check[static 1], mp_subcheck subchec
  * Add a manual summary to a mp_check object, effectively replacing
  * the autogenerated one
  */
-void mp_add_summary(mp_check check[static 1], char *summary) { check->summary = summary; }
+void mp_set_summary(mp_check check[static 1], char *summary) { check->summary = strdup(summary); }
 
 /*
  * Generate the summary string of a mp_check object based on its subchecks
diff --git a/lib/output.h b/lib/output.h
index f5011268..6ca63cfe 100644
--- a/lib/output.h
+++ b/lib/output.h
@@ -87,7 +87,7 @@ int mp_add_subcheck_to_subcheck(mp_subcheck check[static 1], mp_subcheck);
 
 void mp_add_perfdata_to_subcheck(mp_subcheck check[static 1], mp_perfdata);
 
-void mp_add_summary(mp_check check[static 1], char *summary);
+void mp_set_summary(mp_check check[static 1], char *summary);
 
 mp_state_enum mp_compute_check_state(mp_check);
 mp_state_enum mp_compute_subcheck_state(mp_subcheck);