diff --git a/sources/compress.c b/sources/compress.c
index 0bf8485d..6aff515c 100644
--- a/sources/compress.c
+++ b/sources/compress.c
@@ -116,6 +116,7 @@ int SetupOutputGZIP(FILEHANDLE *f)
 /*
 	6: Initiate the deflation
 */
+
 	if ( deflateInit(f->zsp,AR.gzipCompress) != Z_OK ) {
 		MLOCK(ErrorMessageLock);
 		MesPrint("Error from zlib: %s",f->zsp->msg);
diff --git a/sources/setfile.c b/sources/setfile.c
index 5c67df11..05ef8364 100644
--- a/sources/setfile.c
+++ b/sources/setfile.c
@@ -947,6 +947,7 @@ SORTING *AllocSort(LONG LargeSize, LONG SmallSize, LONG SmallEsize, LONG TermsIn
 #ifdef WITHZLIB
 /*	sort->file.ziosize = IOsize; */
 	sort->file.ziosize = IObuffersize*sizeof(WORD);
+	sort->file.ziobuffer = 0;
 #endif
 	if ( AM.S0 != 0 ) {
 		sort->file.name = (char *)(sort->file.PObuffer + IObuffersize);
diff --git a/sources/sort.c b/sources/sort.c
index fd669ada..8cf08612 100644
--- a/sources/sort.c
+++ b/sources/sort.c
@@ -785,7 +785,6 @@ LONG EndSort(PHEAD WORD *buffer, int par)
 #ifdef WITHZLIB
 			{ int oldgzipCompress = AR.gzipCompress;
 				AR.gzipCompress = 0;
-				/* SetupOutputGZIP(fout); */
 #endif
 			if ( tover > 0 ) {
 				ss = S->sPointer;
@@ -1414,9 +1413,12 @@ WORD PutOut(PHEAD WORD *term, POSITION *position, FILEHANDLE *fi, WORD ncomp)
 						fi->handle = (WORD)RetCode;
 						PUTZERO(fi->filesize);
 						PUTZERO(fi->POposition);
+/*
+						Should not be here anymore?
 #ifdef WITHZLIB
 						fi->ziobuffer = 0;
 #endif
+*/
 					}
 					else {
 						MLOCK(ErrorMessageLock);
@@ -1628,9 +1630,12 @@ WORD PutOut(PHEAD WORD *term, POSITION *position, FILEHANDLE *fi, WORD ncomp)
 						fi->handle = (WORD)RetCode;
 						PUTZERO(fi->filesize);
 						PUTZERO(fi->POposition);
+/*
+						Should not be here?
 #ifdef WITHZLIB
 						fi->ziobuffer = 0;
 #endif
+*/
 					}
 					else {
 						MLOCK(ErrorMessageLock);
@@ -1762,9 +1767,12 @@ WORD FlushOut(POSITION *position, FILEHANDLE *fi, int compr)
 				PUTZERO(fi->filesize);
 				PUTZERO(fi->POposition);
 				fi->handle = (WORD)RetCode;
+/*
+				Should not be here?
 #ifdef WITHZLIB
 				fi->ziobuffer = 0;
 #endif
+*/
 			}
 			else {
 				MLOCK(ErrorMessageLock);
@@ -3548,9 +3556,12 @@ WORD MergePatches(WORD par)
 			fout->handle = fhandle;
 			PUTZERO(fout->filesize);
 			PUTZERO(fout->POposition);
+/*
+			Should not be here?
 #ifdef WITHZLIB
 			fout->ziobuffer = 0;
 #endif
+*/
 #ifdef ALLLOCK
 			LOCK(fout->pthreadslock);
 #endif
@@ -3736,7 +3747,6 @@ WORD MergePatches(WORD par)
 			#define FRONTSIZE (2*AM.MaxTer)
 			WORD *copybuf = (WORD *)(((UBYTE *)(S->sBuffer)) + FRONTSIZE);
 			WORD *copytop;
-			SetupOutputGZIP(fout);
 			SetupAllInputGZIP(S);
 			m1 = m2 = copybuf;
 			position2 = S->iPatches[0];
diff --git a/sources/startup.c b/sources/startup.c
index 8450f916..d492f5ad 100644
--- a/sources/startup.c
+++ b/sources/startup.c
@@ -1295,6 +1295,8 @@ WORD IniVars()
 	AM.gOutNumberType = RATIONALMODE;
 #ifdef WITHZLIB
 	AR.gzipCompress = GZIPDEFAULT;
+	AR.FoStage4[0].ziobuffer = 0;
+	AR.FoStage4[1].ziobuffer = 0;
 #endif
 	AR.BracketOn = 0;
 	AC.bracketindexflag = 0;
diff --git a/sources/threads.c b/sources/threads.c
index f1c8b8e4..cdeff1de 100644
--- a/sources/threads.c
+++ b/sources/threads.c
@@ -542,6 +542,8 @@ ALLPRIVATES *InitializeOneThread(int identity)
 #ifdef WITHZLIB
 	AR.FoStage4[0].ziosize = IOsize;
 	AR.FoStage4[1].ziosize = IOsize;
+	AR.FoStage4[0].ziobuffer = 0;
+	AR.FoStage4[1].ziobuffer = 0;
 #endif	
 	AR.FoStage4[0].POsize  = ((IOsize+sizeof(WORD)-1)/sizeof(WORD))*sizeof(WORD);
 	AR.FoStage4[1].POsize  = ((IOsize+sizeof(WORD)-1)/sizeof(WORD))*sizeof(WORD);