diff --git a/src/woff2_dec.cc b/src/woff2_dec.cc
index fda5d85..f95b570 100644
--- a/src/woff2_dec.cc
+++ b/src/woff2_dec.cc
@@ -107,7 +107,7 @@ bool ReadBase128(Buffer* buf, uint32_t* value) {
       return FONT_COMPRESSION_FAILURE();
     }
     // If any of the top seven bits are set then we're about to overflow.
-    if (result & 0xe0000000) {
+    if (result & 0xfe000000) {
       return FONT_COMPRESSION_FAILURE();
     }
     result = (result << 7) | (code & 0x7f);