diff --git a/media/libstagefright/MPEG4Writer.cpp b/media/libstagefright/MPEG4Writer.cpp
index 8b52e15..326930f 100755
--- a/media/libstagefright/MPEG4Writer.cpp
+++ b/media/libstagefright/MPEG4Writer.cpp
@@ -2558,7 +2558,8 @@
     mOwner->writeInt32(0x480000);    // vert resolution
     mOwner->writeInt32(0);           // reserved
     mOwner->writeInt16(1);           // frame count
-    mOwner->write("                                ", 32);
+    mOwner->writeInt8(0);            // compressor string length
+    mOwner->write("                               ", 31);
     mOwner->writeInt16(0x18);        // depth
     mOwner->writeInt16(-1);          // predefined