diff --git a/CUtils/CUtils.xs b/CUtils/CUtils.xs
index cd7fb11ded20dd9326277ce6f636528b70faf210..c0f25ecb8c7f05d5e817db3376203b21a2467fd1 100644
--- a/CUtils/CUtils.xs
+++ b/CUtils/CUtils.xs
@@ -4,9 +4,9 @@
 
 #include "ppport.h"
 
-#include <fisher.h>
-#include <chisq.h>
-#include <double_permutation.h>
+#include "fisher.h"
+#include "chisq.h"
+#include "double_permutation.h"
 
 #include "const-c.inc"
 
diff --git a/CUtils/c_sources/double_permutation.c b/CUtils/c_sources/double_permutation.c
index 66cec1b6228f86b0f264b63a7a698ff9560b7bc3..93cd300728e4def498a9b9f0a95fbc76548f6216 100644
--- a/CUtils/c_sources/double_permutation.c
+++ b/CUtils/c_sources/double_permutation.c
@@ -6,8 +6,8 @@
 #include "double_permutation.h"
 
 #define CALC_PVAL(count, nb_sample) \
-     ((datatype_t)(count-1))/* On s'enlève soi-même*/ \
-     /nb_sample
+     (((datatype_t)(count-1))/* On s'enlève soi-même*/ \
+      /(nb_sample))
 
 
 int read_matrice(matrice_t mat, int nb_sample, int nb_chi2)
diff --git a/CUtils/c_sources/double_permutation.h b/CUtils/c_sources/double_permutation.h
index be62bd5f164cb061ccd50bea71fbd25290a45176..85c204779b693e111a3d97d057c522f7acd55b4a 100644
--- a/CUtils/c_sources/double_permutation.h
+++ b/CUtils/c_sources/double_permutation.h
@@ -1,7 +1,7 @@
 #ifndef _DOUBLE_PERMUTATION_H
 #define _DOUBLE_PERMUTATION_H
 
-#include <datatype.h>
+#include "datatype.h"
 
 typedef datatype_t *ensemble_t;
 typedef ensemble_t *matrice_t;
diff --git a/CUtils/c_sources/fisher.c b/CUtils/c_sources/fisher.c
index 16945c81614843864ebba17d25875b0de0fca526..772c4e23fb4f0d89a2e2252be4d73429f187045b 100644
--- a/CUtils/c_sources/fisher.c
+++ b/CUtils/c_sources/fisher.c
@@ -1,5 +1,5 @@
 
-#include "./fisher.h"
+#include "fisher.h"
 #include <math.h>
 
 typedef struct {