--- a/telnet/utilities.c
+++ b/telnet/utilities.c
@@ -739,22 +739,22 @@ printsub(char direction, unsigned char *
 		case ENV_VAR:
 		  if (pointer[1] == TELQUAL_SEND)
 		    goto def_case;
-		  fprintf(NetTrace, "\" VAR " + noquote);
+		  fprintf(NetTrace, "%s", "\" VAR " + noquote);
 		  noquote = 2;
 		  break;
 
 		case ENV_VALUE:
-		  fprintf(NetTrace, "\" VALUE " + noquote);
+		  fprintf(NetTrace, "%s", "\" VALUE " + noquote);
 		  noquote = 2;
 		  break;
 
 		case ENV_ESC:
-		  fprintf(NetTrace, "\" ESC " + noquote);
+		  fprintf(NetTrace, "%s", "\" ESC " + noquote);
 		  noquote = 2;
 		  break;
 
 		case ENV_USERVAR:
-		  fprintf(NetTrace, "\" USERVAR " + noquote);
+		  fprintf(NetTrace, "%s", "\" USERVAR " + noquote);
 		  noquote = 2;
 		  break;
 
--- a/telnetd/utility.c
+++ b/telnetd/utility.c
@@ -897,17 +897,17 @@ printsub(char direction, unsigned char *
 			case ENV_VAR:
 			    if (pointer[1] == TELQUAL_SEND)
 				goto def_case;
-			    netoprintf("\" VAR " + noquote);
+			    netoprintf("%s", "\" VAR " + noquote);
 			    noquote = 2;
 			    break;
 
 			case ENV_VALUE:
-			    netoprintf("\" VALUE " + noquote);
+			    netoprintf("%s", "\" VALUE " + noquote);
 			    noquote = 2;
 			    break;
 
 			case ENV_ESC:
-			    netoprintf("\" ESC " + noquote);
+			    netoprintf("%s", "\" ESC " + noquote);
 			    noquote = 2;
 			    break;