diff --git a/clients/gopher/go500.c b/clients/gopher/go500.c
index ca03ce0a98..34b3e1a5ef 100644
--- a/clients/gopher/go500.c
+++ b/clients/gopher/go500.c
@@ -213,7 +213,7 @@ main( int argc, char **argv )
 			}
 
 #ifdef LDAP_PROCTITLE
-			setproctitle( hp == NULL ? inet_ntoa( from.sin_addr ) :
+			setproctitle( "%s", hp == NULL ? inet_ntoa( from.sin_addr ) :
 			    hp->h_name );
 #endif
 		}
diff --git a/clients/gopher/go500gw.c b/clients/gopher/go500gw.c
index dfda607001..fc9fa853ee 100644
--- a/clients/gopher/go500gw.c
+++ b/clients/gopher/go500gw.c
@@ -236,7 +236,7 @@ main (int  argc, char **argv )
 			}
 
 #ifdef LDAP_PROCTITLE
-			setproctitle( hp == NULL ? inet_ntoa( from.sin_addr ) :
+			setproctitle( "%s", hp == NULL ? inet_ntoa( from.sin_addr ) :
 			    hp->h_name );
 #endif
 		}