diff --git a/applications/smurf/libsmf/smf_getrefwcs.c b/applications/smurf/libsmf/smf_getrefwcs.c
index 1587a05460e..34cf09db5d3 100644
--- a/applications/smurf/libsmf/smf_getrefwcs.c
+++ b/applications/smurf/libsmf/smf_getrefwcs.c
@@ -85,6 +85,9 @@
 *        parameter.
 *     25-NOV-2013 (DSB):
 *        Added argument "isjsa".
+*     20-AUG-2014 (DSB):
+*        Convert mapregion circle to ICRS before checking to see if it 
+*        crosses any of the JSA ICRS discontinuities.
 *     {enter_further_changes_here}
 
 *  Copyright:
@@ -244,6 +247,9 @@ void smf_getrefwcs( const char *param, Grp *igrp, AstFrameSet **specwcs,
    system. */
                   circle = smf_mapregion_approx( igrp, 1, status );
 
+/* Convert the circle to ICRS (as used by the JSA all-sky grid). */
+                  astSetC( circle, "System", "ICRS" );
+
 /* Get the centre and radius of this circle. */
                   astCirclePars( circle, centre, &radius, NULL );
                   if( ( centre[ 0 ] == AST__BAD || centre[ 1 ] == AST__BAD ||