diff --git a/cudd/cudd/cuddTable.c b/cudd/cudd/cuddTable.c
index d801cf20..2b31990f 100644
--- a/cudd/cudd/cuddTable.c
+++ b/cudd/cudd/cuddTable.c
@@ -81,6 +81,7 @@
 
 ******************************************************************************/
 
+#include <math.h>
 #include "util.h"
 #include "cuddInt.h"
 
@@ -1510,7 +1511,7 @@ cuddUniqueConst(
     // this is the new version...
     // (round off before doing hash function to ensure
     //  close valued constants are in the same table)
-    if (isfinite(value)) {
+    if (finite(value)) {
 		trunc = 10000000000.0; // 10^10
 		m = value * trunc;
 		n = floor(m);