Index: trunk/Ohana/src/opihi/lib.shell/stack_math.c
===================================================================
--- trunk/Ohana/src/opihi/lib.shell/stack_math.c	(revision 40015)
+++ trunk/Ohana/src/opihi/lib.shell/stack_math.c	(revision 40019)
@@ -1226,5 +1226,5 @@
   if (!strcmp (op, "--"))     S_FUNC(-1*M1, ST_SCALAR_INT); // NOTE: opihi_int is signed, 
   if (!strcmp (op, "isinf"))  S_FUNC(!finite(M1), ST_SCALAR_FLT); // XXX modify in future 
-  if (!strcmp (op, "isnan"))  S_FUNC(isnan(M1), ST_SCALAR_FLT); // XXX modify in future   
+  if (!strcmp (op, "isnan"))  S_FUNC(isnan((opihi_flt)(M1)), ST_SCALAR_FLT); // XXX modify in future   
 
 # undef S_FUNC
@@ -1313,5 +1313,5 @@
   if (!strcmp (op, "--"))     V_FUNC(-1*(*M1), ST_SCALAR_INT); // NOTE: opihi_int is signed
   if (!strcmp (op, "isinf"))  V_FUNC(!finite(*M1), ST_SCALAR_FLT);
-  if (!strcmp (op, "isnan"))  V_FUNC(isnan(*M1), ST_SCALAR_FLT);
+  if (!strcmp (op, "isnan"))  V_FUNC(isnan((opihi_flt)(*M1)), ST_SCALAR_FLT);
   if (!strcmp (op, "xramp"))  V_FUNC(i, ST_SCALAR_INT);
   if (!strcmp (op, "yramp"))  V_FUNC(0, ST_SCALAR_INT);