diff --git a/lib/misc/gpio_wb.vhd b/lib/misc/gpio_wb.vhd
index 7454201..32ddf4d 100644
--- a/lib/misc/gpio_wb.vhd
+++ b/lib/misc/gpio_wb.vhd
@@ -34,7 +34,7 @@ END gpio_wb;
 ARCHITECTURE behavior OF gpio_wb IS
 
 	constant num_timers	: natural := 2;
-	constant ncycles_usec	: natural := natural(f_sysclk + 0.5);
+	constant ncycles_usec	: natural := natural(f_sysclk);
 	
 	signal gpo0_reg		: unsigned(31 downto 0);
 	signal gpo1_reg		: unsigned(31 downto 0);
diff --git a/lib/ps2_port/src/ps2_core.vhd b/lib/ps2_port/src/ps2_core.vhd
index 215a2d8..9a3dab0 100644
--- a/lib/ps2_port/src/ps2_core.vhd
+++ b/lib/ps2_port/src/ps2_core.vhd
@@ -69,7 +69,7 @@ type line_state_tx_t is (tx_idle_st, tx_clock_assert_st, tx_start_latency_st,
 								 tx_ack_trans_st, tx_ack_sample_st, tx_valid_st);
 
 -- Constant
-constant prescaler_us          : integer := integer(f_sys_clk + 0.5);
+constant prescaler_us          : integer := integer(f_sys_clk);
 constant timeout_us            : integer := 15000;
 constant time_clock_assert     : integer := 120;
 constant time_clock_abort      : integer := 500;