Index: trunk/psastro/src/psastroModelArguments.c
===================================================================
--- trunk/psastro/src/psastroModelArguments.c	(revision 21183)
+++ trunk/psastro/src/psastroModelArguments.c	(revision 21390)
@@ -9,5 +9,5 @@
     if (argc == 1) {
         psError(PSASTRO_ERR_ARGUMENTS, true, "No arguments supplied");
-        psErrorStackPrint(stderr, usage);
+        psErrorStackPrint(stderr, "%s", usage);
 	exit (1);
     }
@@ -17,5 +17,5 @@
     if (config == NULL) {
         psError(PSASTRO_ERR_CONFIG, false, "Can't read site configuration");
-        psErrorStackPrint(stderr, usage);
+        psErrorStackPrint(stderr, "%s", usage);
 	exit (1);
     }
@@ -34,5 +34,5 @@
     } else {
         psError(PSASTRO_ERR_ARGUMENTS, true, "Missing -output (root)");
-        psErrorStackPrint(stderr, usage);
+        psErrorStackPrint(stderr, "%s", usage);
 	exit (1);
     }