diff --git a/okhttp-protocols/src/main/java/com/squareup/okhttp/internal/spdy/Spdy3.java b/okhttp-protocols/src/main/java/com/squareup/okhttp/internal/spdy/Spdy3.java
index 4001f3e99..25fbbfa04 100644
--- a/okhttp-protocols/src/main/java/com/squareup/okhttp/internal/spdy/Spdy3.java
+++ b/okhttp-protocols/src/main/java/com/squareup/okhttp/internal/spdy/Spdy3.java
@@ -281,7 +281,7 @@ final class Spdy3 implements Variant {
       this.compressedLimit += length;
       try {
         int numberOfPairs = nameValueBlockIn.readInt();
-        if (numberOfPairs < 0) {
+        if ((numberOfPairs * 2) < 0) {
           Logger.getLogger(getClass().getName()).warning("numberOfPairs < 0: " + numberOfPairs);
           throw ioException("numberOfPairs < 0");
         }