source/back.c     | 2 +-
 source/concosts.c | 4 ++--
 source/count.c    | 4 ++--
 source/eden.c     | 2 +-
 source/util.c     | 4 ++--
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/source/back.c b/source/back.c
index fd517b9..185a02b 100644
--- a/source/back.c
+++ b/source/back.c
@@ -112,7 +112,7 @@ void	back_main(int argc, char *argv[])
           ballpark(caller) ;
 
      if (argc > optind+2)
-	  sprintf(sf_filename, argv[optind+2]) ;
+	  sprintf(sf_filename, "%s", argv[optind+2]) ;
 
   /*********************************************
   Pull off prefix defining whereabouts of input 
diff --git a/source/concosts.c b/source/concosts.c
index d62d2e3..590f073 100644
--- a/source/concosts.c
+++ b/source/concosts.c
@@ -452,7 +452,7 @@ void	prepare_singlets(char *filename)
                       sprintf(message, 
 		      "s=%d, p=%d, n=%d, phase=%g, old phase=%g, delta=%g\n", 
                       s, p, n, phase, *(checks+n), phase-*(checks+n)) ;
-                      fprintf(fp_log, message) ;
+                      fprintf(fp_log, "%s", message) ;
                  }
               } 
 		/***********************************************
@@ -556,7 +556,7 @@ void	prepare_triplets(char *filename)
 		 sprintf(message, 
 "Triplet (%d %d %d) from input (%d %d %d) corresponds to point w/o fobs info!\n",
 		   newh, newk, newl, t_h[q], t_k[q], t_l[q]) ;
-		 fprintf(fp_log, message) ;
+		 fprintf(fp_log, "%s", message) ;
 		 legal_triplet = FALSE ;
               }
            }
diff --git a/source/count.c b/source/count.c
index c3bc390..ca13008 100644
--- a/source/count.c
+++ b/source/count.c
@@ -460,12 +460,12 @@ void	print_el_count(char *filename,
      }
 
      sprintf(message, "\nTotal no. of electrons is %g\n", totnump*volvox) ;
-     fprintf(fp, message) ;
+     fprintf(fp, "%s", message) ;
      printTwice(message) ;
 
      sprintf(message, "Count of all remaining electrons: %g %g %g\n", 
      remainder0*volvox, remainder1*volvox, remainder2*volvox) ;
-     fprintf(fp, message) ;
+     fprintf(fp, "%s", message) ;
      printTwice(message) ;
 
      fclose(fp) ;
diff --git a/source/eden.c b/source/eden.c
index dea3246..5a9b389 100644
--- a/source/eden.c
+++ b/source/eden.c
@@ -319,7 +319,7 @@ int	main(int argc, char *argv[])
 
      get_unique_logname() ;
 
-     sprintf(command_line, argv[0]) ;
+     sprintf(command_line, "%s", argv[0]) ;
 
      for (k = 1; k < argc; k++) { 
          strcat(command_line, " ") ;
diff --git a/source/util.c b/source/util.c
index 6fff179..41c624c 100644
--- a/source/util.c
+++ b/source/util.c
@@ -266,7 +266,7 @@ void	printTwice(char *mess)	/* send info to terminal (stdout) and to log */
  
 void	prompt(char *mess)	/* Send message to user, await reply */
 {
-    fprintf(stdout, mess) ;
+    fprintf(stdout, "%s", mess) ;
 
     while (fgets(terminp, MAXSTRING, stdin) != NULL)  {
 	if ((int)strlen(terminp) > 0) 
@@ -722,7 +722,7 @@ void	start_record()
      int	k ;
 
      rec_length = k = sprintf(record, "\n") ;
-     rec_length += sprintf(record+k, timestamp()) ;
+     rec_length += sprintf(record+k, "%s", timestamp()) ;
      k = rec_length ;
 
      if ((cwd = getcwd(NULL, 120)) == NULL)