diff --git a/src/core/base_stream.js b/src/core/base_stream.js
index a5a0eb1b5..aa4dc7e56 100644
--- a/src/core/base_stream.js
+++ b/src/core/base_stream.js
@@ -104,6 +104,9 @@ class BaseStream {
     const b1 = this.getByte();
     const b2 = this.getByte();
     const b3 = this.getByte();
+    if (b0 === -1 || b1 === -1 || b2 === -1 || b3 === -1) {
+      return -1;
+    }
     return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3;
   }