diff --git a/fp.texi b/fp.texi
index 8824dd8..01ebae2 100644
--- a/fp.texi
+++ b/fp.texi
@@ -532,6 +532,7 @@ int main (void)
 @{
   double x = 100.0;
   double y;
+  int n, k;
   for (n = 10; n <= 100; n += 10)
     @{
       y = x;
@@ -1127,7 +1128,7 @@ can write code like this example for interval addition of two reals:
     @{
       double hi, lo;
     @} v;
-  volatile double x, y;
+  extern volatile double x, y;
   int rule;
 
   rule = fegetround ();