diff --git a/devtimer.py b/devtimer.py
index 93155f3..f7cabb1 100755
--- a/devtimer.py
+++ b/devtimer.py
@@ -247,14 +247,25 @@
 def footsw_pressed():
     global RUNNING
 
-    # Process footswitch press accounting for debounce
+    # Ignore interrupts during debounce window
 
-    if time() - footsw_pressed.lastISR >= 0.100:
+    if not footsw_pressed.debouncing:
+
         RUNNING = not RUNNING
+
+        if DEBUG:
+            print("Running State: %s" % RUNNING)
+
+    # Mask interrupts during debounce window
+
+    if time() - footsw_pressed.lastISR >= 0.040:
+
+        footsw_pressed.debouncing = False
         footsw_pressed.lastISR = time()
 
-    if DEBUG:
-        print("Running State: %s" % RUNNING)
+    else:
+
+        footsw_pressed.debouncing = True
 
 
 # Check to see if footswitch got pressed
@@ -263,6 +274,7 @@
 
     # We store last interrupt service time as a callback global for debounce
 
+    footsw_pressed.debouncing = False
     footsw_pressed.lastISR = 0
 
     # Setup the callback