diff --git a/src/smapi.cc b/src/smapi.cc
index 14b6ffc74..a2cf0854f 100644
--- a/src/smapi.cc
+++ b/src/smapi.cc
@@ -69,7 +69,7 @@ static char *smapi_read_str(const char *path)
 			perror("fscanf()");
 		fclose(fp);
 	}
-	return strndup(str, text_buffer_size);
+	return strndup(str, text_buffer_size.get(*state));
 }
 
 static char *smapi_get_str(const char *fname)