diff -Nru echoping-6.0.2-orig/echoping.c echoping-6.0.2/echoping.c
--- echoping-6.0.2-orig/echoping.c	2007-04-05 14:40:49.000000000 +0200
+++ echoping-6.0.2/echoping.c	2010-06-07 10:31:23.000000000 +0200
@@ -473,7 +473,7 @@
 	if (plugin_name) {
 		ext = strstr(plugin_name, ".so");
 		if ((ext == NULL) || (strcmp(ext, ".so") != 0))
-			sprintf(plugin_name, "%s.so", plugin_name);
+			strcat(plugin_name, ".so");
 		plugin = dlopen(plugin_name, RTLD_NOW);
 		if (!plugin) {
 			/* Retries with the absolute name */