diff --git a/tc/normal.c b/tc/normal.c
index 6ec2600a..e6683db8 100644
--- a/tc/normal.c
+++ b/tc/normal.c
@@ -26,7 +26,7 @@ main(int argc, char **argv)
 	double x, *table;
 	int i, n;
 
-	table = calloc(sizeof(double), TABLESIZE);
+	table = calloc(sizeof(double), TABLESIZE+1);
 	if (!table) {
 		fprintf(stderr, "Not enough memory\n");
 		return 1;
diff --git a/tc/paretonormal.c b/tc/paretonormal.c
index b5ce9152..c793df6d 100644
--- a/tc/paretonormal.c
+++ b/tc/paretonormal.c
@@ -54,7 +54,7 @@ main(int argc, char **argv)
 	double *table;
 	int i,n;
 
-	table = calloc(TABLESIZE, sizeof(double));
+	table = calloc(TABLESIZE+1, sizeof(double));
 	if (!table) {
 		fprintf(stderr, "Out of memory!\n");
 		exit(1);