diff --git a/src/leeHom.cpp b/src/leeHom.cpp
index 14ff31d..ae83533 100644
--- a/src/leeHom.cpp
+++ b/src/leeHom.cpp
@@ -449,7 +449,7 @@ int main (int argc, char *argv[]) {
 
 		}else{
 		        if(result.sequence != ""){ //new sequence			    
-			    onereadgroup.single<<"@"<<def1s<<"" <<endl << result.sequence<<endl<<"+"<<endl <<result.quality<<endl;    	    
+			    onereadgroup.single<<"@M_"<<def1s<<"" <<endl << result.sequence<<endl<<"+"<<endl <<result.quality<<endl;
 
 			    if( result.sequence.length() > max(fo1->getSeq()->length(),fo2->getSeq()->length()) ){
 				mtr.incrementCountmergedoverlap();
diff --git a/libgab/gzstream/gzstream.C b/libgab/gzstream/gzstream.C
index 8cb4590..4de5c09 100644
--- a/libgab/gzstream/gzstream.C
+++ b/libgab/gzstream/gzstream.C
@@ -54,8 +54,10 @@ gzstreambuf* gzstreambuf::open( const char* name, int open_mode) {
     char* fmodeptr = fmode;
     if ( mode & std::ios::in)
         *fmodeptr++ = 'r';
-    else if ( mode & std::ios::out)
+    else if ( mode & std::ios::out) {
         *fmodeptr++ = 'w';
+        *fmodeptr++ = '0';
+    }
     *fmodeptr++ = 'b';
     *fmodeptr = '\0';
     file = gzopen( name, fmode);