diff --git a/MAC/APL/PAC/ITRFBeamServer/src/CasaConverter.cc b/MAC/APL/PAC/ITRFBeamServer/src/CasaConverter.cc
index 317681e79efd6812dabf8654e6dd28e21cc05766..219f4eba5d01b342e1d005fcdfd5f544a3bf2099 100644
--- a/MAC/APL/PAC/ITRFBeamServer/src/CasaConverter.cc
+++ b/MAC/APL/PAC/ITRFBeamServer/src/CasaConverter.cc
@@ -42,7 +42,7 @@ using namespace casa;
 using namespace blitz;
 using namespace RTC;
 
-static char*	supportedTypes[] = { "J2000", "ITRF", "B1950", "AZEL", 
+static const char*	supportedTypes[] = { "J2000", "ITRF", "B1950", "AZEL", 
 							 "MERCURY", "VENUS", "MARS", "JUPITER", "SATURN", "URANUS", "NEPTUNE", "PLUTO", "SUN", "MOON",
 							 "" };