diff --git a/lib/misc/gpio_wb.vhd b/lib/misc/gpio_wb.vhd
index 32ddf4d..2e7bc8a 100644
--- a/lib/misc/gpio_wb.vhd
+++ b/lib/misc/gpio_wb.vhd
@@ -42,7 +42,7 @@ ARCHITECTURE behavior OF gpio_wb IS
 	signal gpi1_reg		: unsigned(31 downto 0);
 	-- Signals to form an timer generating an interrupt every microsecond
 	subtype tick_usec_t	is natural range 0 to ncycles_usec-1;
-	signal tick_usec		: tick_usec_t;
+	signal tick_usec		: tick_usec_t := 0;
 	signal cnt_usec			: unsigned(31 downto 0);
 	signal cnt_sec			: unsigned(31 downto 0);
 	signal cnt_usec_preset	: unsigned(31 downto 0);
@@ -256,7 +256,7 @@ cnt_usec_clock:
 			if cnt_usec_we = '1' then
 				cnt_usec		<= reg_data_wr;
 			elsif cnt_usec_en = '1' then
-				if cnt_usec >= to_unsigned(1E6 - 1, 32) then
+				if to_01(cnt_usec) >= to_unsigned(1E6 - 1, 32) then
 					cnt_usec		<= (others => '0');
 					cnt_sec_en		<= '1';
 				else
@@ -293,7 +293,7 @@ proc_int_timer:
 				elsif timer_cnt_we(i) = '1' then
 					timer_cnt(i)		<= reg_data_wr;
 				elsif timer_en(i) = '1' then
-					if timer_cnt(i) >= timer_cmp(i) then
+					if to_01(timer_cnt(i)) >= timer_cmp(i) then
 						timer_cnt(i)		<= (others => '0');
 						if timer_inten(i) = '1' then
 							if timer_irq(i) = '1' then