diff --git a/litex/build/gowin/gowin.py b/litex/build/gowin/gowin.py
index 58f7ad2b9..c48bb1a89 100644
--- a/litex/build/gowin/gowin.py
+++ b/litex/build/gowin/gowin.py
@@ -109,6 +109,8 @@ class GowinToolchain:
         # Apply Synthesis directives.
         tools.replace_in_file(v_file, "wire [0:0] IO_hpram_rwds,", "wire [0:0] IO_hpram_rwds, /* synthesis syn_tristate = 1 */")
         tools.replace_in_file(v_file, "wire [7:0] IO_hpram_dq,",    "wire [7:0] IO_hpram_dq,  /* synthesis syn_tristate = 1 */")
+        tools.replace_in_file(v_file, "[1:0] IO_psram_rwds,", "[1:0] IO_psram_rwds, /* synthesis syn_tristate = 1 */")
+        tools.replace_in_file(v_file, "[15:0] IO_psram_dq,",    "[15:0] IO_psram_dq,  /* synthesis syn_tristate = 1 */")
 
     def build(self, platform, fragment,
         build_dir  = "build",