diff --git a/tools/lib/h5diff.c b/tools/lib/h5diff.c
index 640a20a..c812e0e 100644
--- a/tools/lib/h5diff.c
+++ b/tools/lib/h5diff.c
@@ -617,7 +617,7 @@ hsize_t h5diff(const char *fname1,
     char         filenames[2][MAX_FILENAME];
     hsize_t      nfound = 0;
     int i;
-    //int i1, i2;
+    /*int i1, i2;*/
     int l_ret;
     const char * obj1fullname = NULL;
     const char * obj2fullname = NULL;
diff --git a/tools/lib/h5tools_utils.c b/tools/lib/h5tools_utils.c
index 361cd6a..3338e80 100644
--- a/tools/lib/h5tools_utils.c
+++ b/tools/lib/h5tools_utils.c
@@ -40,7 +40,7 @@ int         opt_err = 1;    /*get_option prints errors if this is on */
 int         opt_ind = 1;    /*token pointer                          */
 const char *opt_arg;        /*flag argument (or value)               */
 static int  h5tools_d_status = 0;
-//static const char  *h5tools_progname = "h5tools";
+/*static const char  *h5tools_progname = "h5tools";*/
 static char  *h5tools_progname = "h5tools";
 
 /* ``parallel_print'' variables */