diff --git a/src/apk_normalized.cpp b/src/apk_normalized.cpp
index 11e1062..d8ceb44 100644
--- a/src/apk_normalized.cpp
+++ b/src/apk_normalized.cpp
@@ -60,6 +60,7 @@ static void printUsage(){
            "  -as-alignSize\n"
            "    set align size for uncompressed file in zip for optimize app run speed,\n"
            "    1 <= alignSize <= 4k, recommended 4,8, DEFAULT -as-8.\n"
+           "    NOTE: if -ap-1, must 4096%%alignSize==0;\n"
            "  -ap-isPageAlignSoFile\n"
            "    if found uncompressed .so file in the zip, need align it to 4k page?\n"
            "      -ap-0         not page-align uncompressed .so files;\n"
diff --git a/src/diff/DiffData.cpp b/src/diff/DiffData.cpp
index 49306eb..c598d69 100644
--- a/src/diff/DiffData.cpp
+++ b/src/diff/DiffData.cpp
@@ -60,11 +60,6 @@ bool zipFileData_isSame(UnZipper* selfZip,int selfIndex,UnZipper* srcZip,int src
     return 0==memcmp(buf.data(),buf.data()+selfFileSize,selfFileSize);
 }
 
-
-bool getIsStampCertFile(const UnZipper* self,int fileIndex){
-    return UnZipper_file_is_lastNameWith(self,fileIndex,"stamp-cert-sha256",17);
-}
-
 bool getZipIsSameWithStream(const hpatch_TStreamInput* oldZipStream,
                             const hpatch_TStreamInput* newZipStream,
                             int newApkFilesRemoved,bool* out_isOldHaveApkV2Sign){
@@ -103,7 +98,7 @@ bool getZipIsSameWithStream(const hpatch_TStreamInput* oldZipStream,
         for (std::map<std::string,int>::iterator it=oldMap.begin();it!=oldMap.end();++it){
             int old_i=it->second;
             check_clear(UnZipper_file_isApkV1Sign(&oldZip,old_i)
-                        ||getIsStampCertFile(&oldZip,old_i)
+                        ||UnZipper_file_isStampCertFile(&oldZip,old_i)
                         ||(UnZipper_file_uncompressedSize(&oldZip,old_i)==0));
         }
     }
diff --git a/src/diff/DiffData.h b/src/diff/DiffData.h
index d3a0228..69a2fd9 100644
--- a/src/diff/DiffData.h
+++ b/src/diff/DiffData.h
@@ -61,7 +61,6 @@ static inline std::string zipFile_name(const UnZipper* self,int fileIndex){
     const char* nameBegin=UnZipper_file_nameBegin(self,fileIndex);
     return std::string(nameBegin,nameBegin+nameLen);
 }
-bool getIsStampCertFile(const UnZipper* self,int fileIndex);
 
 bool getSamePairList(UnZipper* newZip,UnZipper* oldZip,
                      bool newCompressedDataIsNormalized,
diff --git a/src/normalized/normalized.cpp b/src/normalized/normalized.cpp
index 4f2853a..2f5bbb8 100644
--- a/src/normalized/normalized.cpp
+++ b/src/normalized/normalized.cpp
@@ -162,7 +162,7 @@ bool ZipNormalized(const char* srcApk,const char* dstApk,int ZipAlignSize,int co
                     continue; //remove JarSign(ApkV1Sign) when found ApkV2Sign
                 }
             }
-            if (getIsStampCertFile(&unzipper,fileIndex)){
+            if (UnZipper_file_isStampCertFile(&unzipper,fileIndex)){
                 ++apkFilesRemoved;
                 removedFiles.push_back(files[i].fileName);
                 continue; //remove stamp cert file
diff --git a/src/patch/Patcher.cpp b/src/patch/Patcher.cpp
index b43215b..13e24c4 100644
--- a/src/patch/Patcher.cpp
+++ b/src/patch/Patcher.cpp
@@ -154,7 +154,7 @@ TPatchResult VirtualZipPatchWithStream(const hpatch_TStreamInput* oldZipStream,c
     check(oldStream.stream->streamSize==diffInfo.oldDataSize,PATCH_OLDDATA_ERROR);
     
     check(Zipper_openStream(&out_newZip,outNewZipStream,(int)zipDiffData.newZipFileCount,
-                          (int)zipDiffData.newZipAlignSize,(int)zipDiffData.newCompressLevel,
+                          (int)zipDiffData.newZipAlignSize,(int)zipDiffData.newZipAlignSize,(int)zipDiffData.newCompressLevel,
                           (int)zipDiffData.newCompressMemLevel),PATCH_OPENWRITE_ERROR);
     check(NewStream_open(&newStream,&out_newZip,&oldZip,  (size_t)diffInfo.newDataSize,
                          zipDiffData.newZipIsDataNormalized!=0,
diff --git a/src/patch/Zipper.cpp b/src/patch/Zipper.cpp
index 2ad6236..c928aae 100644
--- a/src/patch/Zipper.cpp
+++ b/src/patch/Zipper.cpp
@@ -1020,7 +1020,8 @@ static bool _write_fileHeaderInfo(Zipper* self,int fileIndex,UnZipper* srcZip,in
     if (isNeedAlign){
         size_t headInfoLen=30+fileNameLen+extraFieldLen;
         size_t skipLen=_getAlignSkipLen(self->_curFilePos+headInfoLen,self->_ZipAlignSize);
-        if (UnZipper_file_is_nameEndWith(srcZip,srcFileIndex,".so",3)){
+        if ((self->_SoPageAlignSize!=self->_ZipAlignSize)&&UnZipper_file_is_nameEndWith(srcZip,srcFileIndex,".so",3)){
+            check(0==(self->_SoPageAlignSize%self->_ZipAlignSize));
             size_t skipSoLen=_getAlignSkipLen(self->_curFilePos+headInfoLen,self->_SoPageAlignSize);
             if (skipSoLen!=skipLen){
                 skipLen=skipSoLen;
diff --git a/src/patch/Zipper.h b/src/patch/Zipper.h
index 18062f2..e740744 100644
--- a/src/patch/Zipper.h
+++ b/src/patch/Zipper.h
@@ -120,6 +120,9 @@ bool UnZipper_file_is_sameName(const UnZipper* self,int fileIndex,const char* pa
 bool UnZipper_file_is_lastNameWith(const UnZipper* self,int fileIndex,const char* lastName,int lastNameLen);
 bool UnZipper_file_is_nameEndWith(const UnZipper* self,int fileIndex,const char* nameSuffix,int nameSuffixLen);//file name is end with nameSuffix
 
+static inline bool UnZipper_file_isStampCertFile(const UnZipper* self,int fileIndex){
+    return UnZipper_file_is_lastNameWith(self,fileIndex,"stamp-cert-sha256",17);
+}
     
     struct TZipThreadWorks;
     struct TZipThreadWork;