diff --git a/src/gcrcell.c b/src/gcrcell.c
index cb0bf66..3b69ead 100644
--- a/src/gcrcell.c
+++ b/src/gcrcell.c
@@ -100,9 +100,9 @@
     }                                                          \
   } while (0)
 
-unsigned todo_uses = 0;
-unsigned todo_misses = 0;
-unsigned todo_reads = 0;
+static unsigned todo_uses = 0;
+static unsigned todo_misses = 0;
+static unsigned todo_reads = 0;
 
 /************************************************************************/
 /*									*/