diff --git a/Sources/DataWithPointer.swift b/Sources/DataWithPointer.swift
index 529bba6b..a259176c 100644
--- a/Sources/DataWithPointer.swift
+++ b/Sources/DataWithPointer.swift
@@ -88,6 +88,7 @@ class DataWithPointer {
     // MARK: Manipulations with index and bitShift
 
     func skipUntilNextByte() {
+        guard self.bitShift != 0 else { return }
         self.index += 1
         self.bitShift = 0
     }