diff --git a/Source/InputMethodController.mm b/Source/InputMethodController.mm
index 42d0a67a..ba34051f 100644
--- a/Source/InputMethodController.mm
+++ b/Source/InputMethodController.mm
@@ -498,7 +498,9 @@ public:
     bool composeReading = false;
     
     // caps lock processing : if caps locked, temporarily disabled bopomofo.
-	if ([NSEvent modifierFlags] & NSAlphaShiftKeyMask){
+	if (charCode == 8) {
+       // Do nothing if backspace is pressed
+	} else if ([NSEvent modifierFlags] & NSAlphaShiftKeyMask){
 		if ([_composingBuffer length]) [self commitComposition:client];
 		if ([NSEvent modifierFlags] & NSShiftKeyMask) return NO;
 		NSString *popedText = [inputText lowercaseString];