diff --git a/proc/sig.c b/proc/sig.c
index b427e01e..7d23edc4 100644
--- a/proc/sig.c
+++ b/proc/sig.c
@@ -259,7 +259,7 @@ void pretty_print_signals(void){
   while(++i <= number_of_signals){
     int n;
     n = printf("%2d %s", i, signal_number_to_name(i));
-    if(n>0 && i%7) printf("           \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" + n);
+    if(n>0 && i%7) printf("%s", "           \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" + n);
     else printf("\n");
   }
   if((i-1)%7) printf("\n");
diff --git a/ps/global.c b/ps/global.c
index 11f058e5..0898a5ea 100644
--- a/ps/global.c
+++ b/ps/global.c
@@ -514,6 +514,6 @@ catastrophic_failure(const char *filename,
 		     unsigned int linenum,
 		     const char *message)
 {
-  error_at_line(0, 0, filename, linenum, message);
+  error_at_line(0, 0, filename, linenum, "%s", message);
   exit(EXIT_FAILURE);
 }