diff --git a/src/cnn/function.c b/src/cnn/function.c
index 4ac6ecb..71af124 100644
--- a/src/cnn/function.c
+++ b/src/cnn/function.c
@@ -107,20 +107,16 @@ float leaky_relu_derivative(float x) {
 
 //* Tanh
 #ifdef __CUDACC__
-__device__
-#endif
-float device_tanh_(float x) {
+__device__ float device_tanh_(float x) {
     return tanh(x);
 }
 
-#ifdef __CUDACC__
-__device__
-#endif
-float device_tanh_derivative(float x) {
+__device__ float device_tanh_derivative(float x) {
     float a = tanh(x);
     return 1 - a*a;
 }
 
+#endif
 float tanh_(float x) {
     return tanh(x);
 }
@@ -303,6 +299,7 @@ funcPtr get_activation_function(int activation) {
 
 
 #ifdef __CUDACC__
+extern "C"
 funcPtr get_activation_function_cuda(int activation) {
     funcPtr host_function;
     
diff --git a/src/cnn/function.cu b/src/cnn/function.cu
index 4ac6ecb..22bfae6 100644
--- a/src/cnn/function.cu
+++ b/src/cnn/function.cu
@@ -107,19 +107,15 @@ float leaky_relu_derivative(float x) {
 
 //* Tanh
 #ifdef __CUDACC__
-__device__
-#endif
-float device_tanh_(float x) {
+__device__ float device_tanh_(float x) {
     return tanh(x);
 }
 
-#ifdef __CUDACC__
-__device__
-#endif
-float device_tanh_derivative(float x) {
+__device__ float device_tanh_derivative(float x) {
     float a = tanh(x);
     return 1 - a*a;
 }
+#endif
 
 float tanh_(float x) {
     return tanh(x);
@@ -303,6 +299,7 @@ funcPtr get_activation_function(int activation) {
 
 
 #ifdef __CUDACC__
+extern "C"
 funcPtr get_activation_function_cuda(int activation) {
     funcPtr host_function;
     
diff --git a/src/cnn/include/function.h b/src/cnn/include/function.h
index 4234009..6ff17b4 100644
--- a/src/cnn/include/function.h
+++ b/src/cnn/include/function.h
@@ -142,6 +142,9 @@ funcPtr get_activation_function(int activation);
 /*
 * Récupère un pointeur sur le device vers la fonction d'activation demandée puis le transforme en pointeur sur l'host
 */
+#ifdef __CUDACC__
+extern "C"
 funcPtr get_activation_function_cuda(int activation);
+#endif
 
 #endif
\ No newline at end of file