diff --git a/test_regress/t/t_dpi_open.v b/test_regress/t/t_dpi_open.v
index 5556d21ec..e088cf381 100644
--- a/test_regress/t/t_dpi_open.v
+++ b/test_regress/t/t_dpi_open.v
@@ -49,6 +49,19 @@ module t;
   integer    i_integer [1:0];
   integer    o_integer [1:0];
 
+  bit i_oba_b1;
+  bit o_oba_b1;
+  bit [7:0] i_oba_b8;
+  bit [7:0] o_oba_b8;
+  bit [15:0] i_oba_b16;
+  bit [15:0] o_oba_b16;
+  bit [16:0] i_oba_b17;
+  bit [16:0] o_oba_b17;
+  bit [31:0] i_oba_b32;
+  bit [31:0] o_oba_b32;
+  bit [63:0] i_oba_b64;
+  bit [63:0] o_oba_b64;
+
   import "DPI-C" function int dpii_failure();
 
   import "DPI-C" function void dpii_unused(input reg u []);
@@ -80,6 +93,8 @@ module t;
   import "DPI-C" function void dpii_open_int_u2(int u, input int i [] [], output int o [] []);
   import "DPI-C" function void dpii_open_int_u3(int u, input int i [] [] [], output int o [] [] []);
 
+  import "DPI-C" function void dpii_oba(int width, input int i [], output int o []);
+
   // verilator lint_on UNUSED
 
   reg [95:0] crc;
@@ -157,6 +172,25 @@ module t;
       end
     end
 
+    i_oba_b1 = crc[0];
+    i_oba_b8 = crc[7:0];
+    i_oba_b16 = crc[15:0];
+    i_oba_b17 = crc[16:0];
+    i_oba_b32 = crc[31:0];
+    i_oba_b64 = crc[63:0];
+    dpii_oba(1, i_oba_b1, o_oba_b1);
+    dpii_oba(8, i_oba_b8, o_oba_b8);
+    dpii_oba(16, i_oba_b16, o_oba_b16);
+    dpii_oba(17, i_oba_b17, o_oba_b17);
+    dpii_oba(32, i_oba_b32, o_oba_b32);
+    dpii_oba(64, i_oba_b64, o_oba_b64);
+    `checkh(o_oba_b1, ~crc[0]);
+    `checkh(o_oba_b8, ~crc[7:0]);
+    `checkh(o_oba_b16, ~crc[15:0]);
+    `checkh(o_oba_b17, ~crc[16:0]);
+    `checkh(o_oba_b32, ~crc[31:0]);
+    `checkh(o_oba_b64, ~crc[63:0]);
+
     if (dpii_failure()!=0) begin
       $write("%%Error: Failure in DPI tests\n");
       $stop;
diff --git a/test_regress/t/t_dpi_open_c.cpp b/test_regress/t/t_dpi_open_c.cpp
index 57836cd27..01bd870fd 100644
--- a/test_regress/t/t_dpi_open_c.cpp
+++ b/test_regress/t/t_dpi_open_c.cpp
@@ -70,6 +70,8 @@ extern void dpii_open_int_u1(int u, const svOpenArrayHandle i, const svOpenArray
 extern void dpii_open_int_u2(int u, const svOpenArrayHandle i, const svOpenArrayHandle o);
 extern void dpii_open_int_u3(int u, const svOpenArrayHandle i, const svOpenArrayHandle o);
 
+extern void dpii_oba(const svOpenArrayHandle i, const svOpenArrayHandle o);
+
 extern int dpii_failure();
 }
 #endif
@@ -295,3 +297,15 @@ void dpii_open_int_u2(int u, const svOpenArrayHandle i, const svOpenArrayHandle
 void dpii_open_int_u3(int u, const svOpenArrayHandle i, const svOpenArrayHandle o) {
     _dpii_open_int_ux(u, i, o);
 }
+
+void dpii_oba(int width, const svOpenArrayHandle i, const svOpenArrayHandle o) {
+    TEST_CHECK_HEX_EQ(svLeft(i, 0), width - 1);
+    TEST_CHECK_HEX_EQ(svHigh(i, 0), width - 1);
+    TEST_CHECK_HEX_EQ(svRight(i, 0), 0);
+    TEST_CHECK_HEX_EQ(svLow(i, 0), 0);
+    for (int bit = 0; bit < width; ++bit) {
+        const svBitVecVal* const ibvp = static_cast<svBitVecVal*>(svGetArrayPtr(i));
+        svBitVecVal* const obvp = static_cast<svBitVecVal*>(svGetArrayPtr(o));
+        svPutBitselBit(obvp, bit, svGetBitselBit(ibvp, bit) ? 0 : 1);
+    }
+}