diff --git a/litex/soc/cores/jtag.py b/litex/soc/cores/jtag.py
index 5fd9f8038..6d5eb37e2 100644
--- a/litex/soc/cores/jtag.py
+++ b/litex/soc/cores/jtag.py
@@ -383,7 +383,7 @@ class ECP5JTAG(LiteXModule):
             new_tck = Signal()
             self.specials += Instance("LUT4",
                 attr   = {"keep"},
-                **{f"p_{p_init_name}": 2},  # Use toolchain-specific INIT parameter name.
+                **{f"{p_init_name}": 2},  # Use toolchain-specific INIT parameter name.
                 i_A = tck,
                 i_B = 0,
                 i_C = 0,