diff --git a/harbour/contrib/libct/exponent.c b/harbour/contrib/libct/exponent.c
index ee5f3f988b..6969b2734d 100644
--- a/harbour/contrib/libct/exponent.c
+++ b/harbour/contrib/libct/exponent.c
@@ -51,7 +51,7 @@
  *
  */
 
-#include <ct.h>
+#include "ct.h"
 
 /* undefine the following if you want to evaluate the mantissa and exponent from the doubles' bit representation */
 /* #define CT_EXPONENT_MANTISSA_BIT 1 */