diff --git a/src/cnn/include/initialisation.h b/src/cnn/include/initialisation.h
index 20dd38a..6a1f57a 100644
--- a/src/cnn/include/initialisation.h
+++ b/src/cnn/include/initialisation.h
@@ -3,7 +3,6 @@
 
 // Génère un flottant entre 0 et 1
 #define RAND_FLT() ((float)rand())/((float)RAND_MAX)
-#define TWOPI 6.2831853071795864769252867665
 
 #define ZERO 0
 #define GLOROT 1
diff --git a/src/cnn/initialisation.c b/src/cnn/initialisation.c
index e7efa4d..b938548 100644
--- a/src/cnn/initialisation.c
+++ b/src/cnn/initialisation.c
@@ -15,7 +15,7 @@ float randn() {
     while (f1 == 0) {
         f1 = RAND_FLT();
     }
-    return sqrt(-2.0*log(f1))*cos(TWOPI*RAND_FLT());
+    return sqrt(-2.0*log(f1))*cos(2*M_PI*RAND_FLT());
 }
 
 void initialisation_1d_matrix(int initialisation, float* matrix, int dim, int n_in, int n_out) {