diff --git a/src/tools/westcos-tool.c b/src/tools/westcos-tool.c
index c89081cf..8c94e0fd 100644
--- a/src/tools/westcos-tool.c
+++ b/src/tools/westcos-tool.c
@@ -38,9 +38,9 @@
 #include "libopensc/pkcs15.h"
 #include "libopensc/cardctl.h"
 
-static char *version ="0.0.6";
+static const char *version ="0.0.6";
 
-static char *nom_card = "WESTCOS";
+static const char *nom_card = "WESTCOS";
 
 static int finalise = 0;
 static int verbose = 0;