diff --git a/testsuite/issues/issue160/fpu.vhdl b/testsuite/issues/issue160/fpu.vhdl
new file mode 100644
index 0000000..b94509f
--- /dev/null
+++ b/testsuite/issues/issue160/fpu.vhdl
@@ -0,0 +1,27 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity fpu is
+    port (
+        clk         : in std_ulogic;
+        addr        : in std_ulogic_vector(1 downto 0);
+        inverse_est : out std_ulogic_vector(17 downto 0)
+        );
+end entity fpu;
+
+architecture behaviour of fpu is
+    type lookup_table is array(0 to 3) of std_ulogic_vector(17 downto 0);
+
+    signal inverse_table : lookup_table := (
+        18x"3fc01", 18x"3f411", 18x"3ec31", 18x"3e460"
+        );
+begin
+    lut_access: process(clk)
+    begin
+        if rising_edge(clk) then
+            inverse_est <= inverse_table(to_integer(unsigned(addr)));
+        end if;
+    end process;
+
+end architecture behaviour;
diff --git a/testsuite/issues/issue160/fpu2.vhdl b/testsuite/issues/issue160/fpu2.vhdl
new file mode 100644
index 0000000..0b56725
--- /dev/null
+++ b/testsuite/issues/issue160/fpu2.vhdl
@@ -0,0 +1,27 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity fpu is
+    port (
+        clk         : in std_ulogic;
+        addr        : in std_ulogic_vector(1 downto 0);
+        inverse_est : out std_ulogic_vector(17 downto 0)
+        );
+end entity fpu;
+
+architecture behaviour of fpu is
+    type lookup_table is array(0 to 3) of std_ulogic_vector(17 downto 0);
+
+    constant inverse_table : lookup_table := (
+        18x"3fc01", 18x"3f411", 18x"3ec31", 18x"3e460"
+        );
+begin
+    lut_access: process(clk)
+    begin
+        if rising_edge(clk) then
+            inverse_est <= inverse_table(to_integer(unsigned(addr)));
+        end if;
+    end process;
+
+end architecture behaviour;
diff --git a/testsuite/issues/issue160/testsuite.sh b/testsuite/issues/issue160/testsuite.sh
new file mode 100755
index 0000000..0219689
--- /dev/null
+++ b/testsuite/issues/issue160/testsuite.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+topdir=../..
+. $topdir/testenv.sh
+
+for f in fpu fpu2; do
+  synth_import "--std=08 ${f}.vhdl -e"
+done
+
+echo OK