diff --git a/modules/src/object/rd_bytes.c b/modules/src/object/rd_bytes.c
index 3c9822ff..35272b16 100644
--- a/modules/src/object/rd_bytes.c
+++ b/modules/src/object/rd_bytes.c
@@ -4,7 +4,7 @@
    an int!
 */
 
-int maxchunk = MAXCHUNK;
+static int maxchunk = MAXCHUNK;
 
 /*
  * We don't have to worry about byte order here.
diff --git a/modules/src/object/wr_bytes.c b/modules/src/object/wr_bytes.c
index 55e8932e..f7969b89 100644
--- a/modules/src/object/wr_bytes.c
+++ b/modules/src/object/wr_bytes.c
@@ -4,7 +4,7 @@
    You have to put it in an int!
 */
 
-int maxchunk = MAXCHUNK;
+static int maxchunk = MAXCHUNK;
 
 /*
  * Just write "cnt" bytes to file-descriptor "fd".