diff --git a/boards/uniboard2/designs/unb2_minimal/src/vhdl/unb2_minimal.vhd b/boards/uniboard2/designs/unb2_minimal/src/vhdl/unb2_minimal.vhd
index 2f3e2d6f30560dea26716321b49f7a3bbb26237a..fe44cfe325ceebe16430ab2aef8347953c35dee5 100644
--- a/boards/uniboard2/designs/unb2_minimal/src/vhdl/unb2_minimal.vhd
+++ b/boards/uniboard2/designs/unb2_minimal/src/vhdl/unb2_minimal.vhd
@@ -72,7 +72,7 @@ ARCHITECTURE str OF unb2_minimal IS
 
   -- Firmware version x.y
   CONSTANT c_fw_version             : t_unb2_board_fw_version := (1, 1);
-  CONSTANT c_mm_clk_freq            : NATURAL := c_unb2_board_mm_clk_freq_125M;
+  CONSTANT c_mm_clk_freq            : NATURAL := c_unb2_board_mm_clk_freq_50M;
 
   -- System
   SIGNAL cs_sim                     : STD_LOGIC;