diff --git a/lib/axi4s_sv/axi4s_add_bytes.sv b/lib/axi4s_sv/axi4s_add_bytes.sv
index 3989422..57124a0 100644
--- a/lib/axi4s_sv/axi4s_add_bytes.sv
+++ b/lib/axi4s_sv/axi4s_add_bytes.sv
@@ -29,8 +29,8 @@ module axi4s_add_bytes #(
   int ADD_BYTES = 6,
   bit SYNC      = 1
 ) (
-   interface   i,  // AxiStreamIf or AxiStreamPacketIf
-   interface   o   // AxiStreamIf or AxiStreamPacketIf
+   interface.slave  i,  // AxiStreamIf or AxiStreamPacketIf
+   interface.master o   // AxiStreamIf or AxiStreamPacketIf
 );
 
   localparam BYTES_PER_WORD = i.DATA_WIDTH/8;
diff --git a/lib/axi4s_sv/axi4s_fifo.sv b/lib/axi4s_sv/axi4s_fifo.sv
index 647e1dc..c3c7199 100644
--- a/lib/axi4s_sv/axi4s_fifo.sv
+++ b/lib/axi4s_sv/axi4s_fifo.sv
@@ -16,8 +16,8 @@ module axi4s_fifo #(
  ) (
   // Clock domain: i.clk (o.clk is unused)
   input logic clear=1'b0,
-  interface   i,  // AxiStreamIf or AxiStreamPacketIf
-  interface   o,  // AxiStreamIf or AxiStreamPacketIf
+  interface.slave  i,  // AxiStreamIf or AxiStreamPacketIf
+  interface.master o,  // AxiStreamIf or AxiStreamPacketIf
   output logic [15:0] space,
   output logic [15:0] occupied
 );
diff --git a/lib/axi4s_sv/axi4s_remove_bytes.sv b/lib/axi4s_sv/axi4s_remove_bytes.sv
index 4321d87..382cdb1 100644
--- a/lib/axi4s_sv/axi4s_remove_bytes.sv
+++ b/lib/axi4s_sv/axi4s_remove_bytes.sv
@@ -35,8 +35,8 @@ module axi4s_remove_bytes #(
   REM_START=0,
   REM_END=8
 )(
-   interface   i,  // AxiStreamIf or AxiStreamPacketIf
-   interface   o   // AxiStreamIf or AxiStreamPacketIf
+   interface.slave  i,  // AxiStreamIf or AxiStreamPacketIf
+   interface.master o   // AxiStreamIf or AxiStreamPacketIf
 );
 
   localparam BYTES_PER_WORD = i.DATA_WIDTH/8;
diff --git a/lib/axi4s_sv/axi4s_width_conv.sv b/lib/axi4s_sv/axi4s_width_conv.sv
index f05f704..0660ee9 100644
--- a/lib/axi4s_sv/axi4s_width_conv.sv
+++ b/lib/axi4s_sv/axi4s_width_conv.sv
@@ -25,8 +25,8 @@ module axi4s_width_conv #(
   bit    O_USER_TRAILING_BYTES = 0,
   bit    SYNC_CLKS = 1
 ) (
-   interface   i,  // AxiStreamIf or AxiStreamPacketIf
-   interface   o   // AxiStreamIf or AxiStreamPacketIf
+   interface.slave   i,  // AxiStreamIf or AxiStreamPacketIf
+   interface.master  o   // AxiStreamIf or AxiStreamPacketIf
 );
 
   localparam IWIDTH =i.DATA_WIDTH;