diff --git a/vvp/vpi_vthr_vector.cc b/vvp/vpi_vthr_vector.cc
index d5b65f3db..c001767f9 100644
--- a/vvp/vpi_vthr_vector.cc
+++ b/vvp/vpi_vthr_vector.cc
@@ -115,7 +115,14 @@ static void vthr_real_get_value(vpiHandle ref, s_vpi_value*vp)
 	    break;
 
 	  case vpiDecStrVal:
+#if !defined(__GNUC__)
+		if (isnan(val))
+			sprintf(rbuf, "%s", "nan");
+		else
+			sprintf(rbuf, "%0.0f", val);
+#else
 	    sprintf(rbuf, "%0.0f", val);
+#endif
 	    vp->value.str = rbuf;
 	    break;