diff --git a/devtimer.py b/devtimer.py
index 113d0bf..c157181 100755
--- a/devtimer.py
+++ b/devtimer.py
@@ -47,6 +47,7 @@
 
 BEEP = 15                     # Beep interval
 CALIBRATION_OFFSET = 0.003    # Compensate for program overhead in master loop
+MINUS = 16                    # Index of minus segment table lookup
 
 
 #####
@@ -121,9 +122,17 @@
     d3 = display_time.digit_to_segment[sec % 10]
     display_time.set_segments([d0, 0x80 + d1, d2, d3])
 
+# Display current temperature
+# Negative temps are 2 digits, positive temps are 3 digits
+
 def show_temp(display_temp, temp):
 
-    hun = display_time.digit_to_segment[temp // 100]
+    if temp < 0:    # The leading digit is a minus sign
+        hun = display_time.digit_to_segment[MINUS]
+        temp = abs(temp)
+    else:
+        hun = display_time.digit_to_segment[temp // 100]
+
     ten = display_time.digit_to_segment[(temp % 100) // 10]
     one = display_time.digit_to_segment[(temp % 100) % 10]
     F = display_time.digit_to_segment[15]
diff --git a/tm1637.py b/tm1637.py
index dec9ba6..46aace5 100644
--- a/tm1637.py
+++ b/tm1637.py
@@ -37,7 +37,8 @@
         0b0111001, # C
         0b1011110, # d
         0b1111001, # E
-        0b1110001  # F
+        0b1110001, # F
+        0b1000000, # Minus Sign
         ]
 
     def __init__(self, clk, dio, brightness):