diff --git a/MAC/APL/CASATools/src/CasaConverter.cc b/MAC/APL/CASATools/src/CasaConverter.cc
index 7843f726e0e952b14694b9a00037e7b6281c7ec2..1d44bd4e7245d52b70e8b7440a1db545140fdb20 100644
--- a/MAC/APL/CASATools/src/CasaConverter.cc
+++ b/MAC/APL/CASATools/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",
 							 "" };