diff --git a/lib/7segment.c b/lib/7segment.c
index 6177dc2..2b37fd5 100644
--- a/lib/7segment.c
+++ b/lib/7segment.c
@@ -14,25 +14,27 @@ void set_display_raw(volatile uint8_t * header, uint8_t data) {
     *header = data;
 }
 
-uint8_t digit_to_binary(uint8_t input, uint8_t digit) {
+uint8_t digit_to_binary(bool period, uint8_t digit) {
+    uint8_t val = period << 7;
+
     switch(digit) {
-        case 0: return input | 0x3f;
-        case 1: return input | 0x06;
-        case 2: return input | 0x5b;
-        case 3: return input | 0x4f;
-        case 4: return input | 0x66;
-        case 5: return input | 0x6d;
-        case 6: return input | 0x7d;
-        case 7: return input | 0x07;
-        case 8: return input | 0x7f;
-        case 9: return input | 0x6f;
-        // by default only draw the period if it was provided in the input
-        default: return input & (uint8_t) 0x10000000;
+        case 0: return val | 0x3f;
+        case 1: return val | 0x06;
+        case 2: return val | 0x5b;
+        case 3: return val | 0x4f;
+        case 4: return val | 0x66;
+        case 5: return val | 0x6d;
+        case 6: return val | 0x7d;
+        case 7: return val | 0x07;
+        case 8: return val | 0x7f;
+        case 9: return val | 0x6f;
+        // by default draw a dash
+        default: return 0x01000000;
     }
 }
 
 void set_display(volatile uint8_t * header, uint8_t value, bool period) {
-    uint8_t byte = digit_to_binary(period << 7, value);
+    uint8_t byte = digit_to_binary(period, value);
 
     set_display_raw(header, byte);
 }
diff --git a/lib/7segment.h b/lib/7segment.h
index 7a816ec..17a220a 100644
--- a/lib/7segment.h
+++ b/lib/7segment.h
@@ -4,4 +4,4 @@ void set_display_raw(volatile uint8_t * header, uint8_t data);
 
 void set_display(volatile uint8_t * header, uint8_t value, bool period);
 
-uint8_t digit_to_binary(uint8_t in, uint8_t digit);
+uint8_t digit_to_binary(bool period, uint8_t digit);
diff --git a/lib/7segment_4digits.c b/lib/7segment_4digits.c
index 68a75d3..f174ab1 100644
--- a/lib/7segment_4digits.c
+++ b/lib/7segment_4digits.c
@@ -54,6 +54,6 @@ void show_float(float value) {
     for (int i = 0; i < 4; i++) {
         bool show_period = digits == i + 1;
         int digit = get_digit_at_position(full_number, 3 - i);
-        set_display_value(i, digit_to_binary(show_period << 7, digit));
+        set_display_value(i, digit_to_binary(show_period, digit));
     }
 }
diff --git a/main.c b/main.c
index c2444d1..104406d 100644
--- a/main.c
+++ b/main.c
@@ -1,6 +1,6 @@
 #define __AVR_ATmega2560__
 #define F_CPU 16000000UL
-#define TICK_BEEP true
+#define TICK_BEEP false
 
 #include <avr/io.h>
 #include <util/delay.h>