diff --git a/libdm/libdm-string.c b/libdm/libdm-string.c
index 42efcf717..4468555cd 100644
--- a/libdm/libdm-string.c
+++ b/libdm/libdm-string.c
@@ -161,6 +161,7 @@ int dm_asprintf(char **result, const char *format, ...)
 			dm_free(buf);
 			return -1;
 		}
+		dm_free(buf);
 	} else
 		*result = buf;