diff --git a/tools/zipalign/ZipEntry.cpp b/tools/zipalign/ZipEntry.cpp
index 2f33e23..a9c2d33 100644
--- a/tools/zipalign/ZipEntry.cpp
+++ b/tools/zipalign/ZipEntry.cpp
@@ -130,6 +130,7 @@
     if (mCDE.mFileCommentLength > 0) {
         /* TODO: stop assuming null-terminated ASCII here? */
         mCDE.mFileComment = new uint8_t[mCDE.mFileCommentLength+1];
+        assert(comment != NULL);
         strcpy((char*) mCDE.mFileComment, comment);
     }