diff --git a/libopenjpeg/cidx_manager.c b/libopenjpeg/cidx_manager.c
index b659786d..6131b938 100755
--- a/libopenjpeg/cidx_manager.c
+++ b/libopenjpeg/cidx_manager.c
@@ -73,6 +73,7 @@ int write_cidx( int offset, opj_cio_t *cio, opj_image_t *image, opj_codestream_i
   opj_jp2_box_t *box;
   int num_box = 0;
   opj_bool  EPHused;
+  (void)image; /* unused ? */
 
   lenp = -1;
   box = (opj_jp2_box_t *)opj_calloc( 32, sizeof(opj_jp2_box_t));
diff --git a/libopenjpeg/phix_manager.c b/libopenjpeg/phix_manager.c
index c6a8889a..60a02811 100755
--- a/libopenjpeg/phix_manager.c
+++ b/libopenjpeg/phix_manager.c
@@ -90,6 +90,7 @@ int write_phixfaix( int coff, int compno, opj_codestream_info_t cstr_info, opj_b
   int resno, precno, layno, num_packet;
   int numOfres, numOfprec, numOflayers;
   packet.end_ph_pos = packet.start_pos = -1;
+  (void)EPHused; /* unused ? */
 
   if( j2klen > pow( 2, 32)){
     size_of_coding =  8;
diff --git a/libopenjpeg/ppix_manager.c b/libopenjpeg/ppix_manager.c
index 01d05110..b0b4fe6f 100755
--- a/libopenjpeg/ppix_manager.c
+++ b/libopenjpeg/ppix_manager.c
@@ -94,6 +94,7 @@ int write_ppixfaix( int coff, int compno, opj_codestream_info_t cstr_info, opj_b
   int resno, precno, layno, num_packet;
   int numOfres, numOfprec, numOflayers;
   packet.end_ph_pos = packet.start_pos = -1;
+  (void)EPHused; /* unused ? */
 
   if( j2klen > pow( 2, 32)){
     size_of_coding =  8;