diff --git a/test_regress/t/t_math_svl.pl b/test_regress/t/t_math_svl.pl
index 030802e1f..b3f97d2a2 100755
--- a/test_regress/t/t_math_svl.pl
+++ b/test_regress/t/t_math_svl.pl
@@ -7,8 +7,6 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 # Lesser General Public License Version 3 or the Perl Artistic License
 # Version 2.0.
 
-$Self->{vlt} or $Self->skip("Verilator only test");
-
 compile (
     );
 
diff --git a/test_regress/t/t_math_svl.v b/test_regress/t/t_math_svl.v
index 5e4256fe3..8f68717c8 100644
--- a/test_regress/t/t_math_svl.v
+++ b/test_regress/t/t_math_svl.v
@@ -23,7 +23,7 @@ module t (/*AUTOARG*/
    reg 	      wo;
    reg 	      w0;
 
-   always_comb @* begin
+   always @* begin
       lc = $countones(l);
       lo = $onehot(l);
       l0 = $onehot0(l);
@@ -36,11 +36,23 @@ module t (/*AUTOARG*/
    end
 
    integer cyc; initial cyc=1;
+   integer cyc_com;
+   always_comb begin
+      cyc_com = cyc;
+   end
+
+   integer cyc_d1;
    always_ff @ (posedge clk) begin
+      cyc_d1 <= cyc_com;
+   end
+
+   always @ (posedge clk) begin
       if (cyc!=0) begin
 	 cyc <= cyc + 1;
 	 //$write("%d %x %d %x %x   %x %d %x %x  %x %d %x %x\n",
 	 //	cyc, l, lc, lo, l0,   q,qc,qo,q0,  w,wc,wo,w0);
+	 if (cyc_com != cyc_com) $stop;
+	 if (cyc_d1 != cyc-1) $stop;
 	 if (cyc==0) begin
 	    // Constification check
 	    if ($countones(32'b11001011101) != 7) $stop;