diff --git a/Makefile b/Makefile
index c904d8b..c59348a 100644
--- a/Makefile
+++ b/Makefile
@@ -70,7 +70,7 @@ $(BUILDDIR)/dense_%.o: $(DENSE_SRCDIR)/%.c $(DENSE_SRCDIR)/include/%.h
 #
 # Build cnn
 #
-cnn: $(BUILDDIR)/cnn-main $(BUILDDIR)/cnn-main-cuda $(BUILDDIR)/cnn-preview $(BUILDDIR)/cnn-export;
+cnn: $(BUILDDIR)/cnn-main $(BUILDDIR)/cnn-main-cuda $(BUILDDIR)/cnn-preview $(BUILDDIR)/cnn-export $(BUILDDIR)/cnn-export-cuda;
 
 $(BUILDDIR)/cnn-main: $(CNN_SRCDIR)/main.c \
 		$(BUILDDIR)/cnn_backpropagation.o \
@@ -147,6 +147,24 @@ $(BUILDDIR)/cnn-export: $(CNN_SRCDIR)/export.c \
 	$(CC)  $^ -o $@  $(CFLAGS) $(LD_CFLAGS)
 
 
+$(BUILDDIR)/cnn-export-cuda: $(CNN_SRCDIR)/export.c \
+		$(BUILDDIR)/cnn_cuda_backpropagation.o \
+		$(BUILDDIR)/cnn_cuda_convolution.o \
+		$(BUILDDIR)/cnn_neuron_io.cuda.o \
+		$(BUILDDIR)/cnn_cuda_function.o \
+		$(BUILDDIR)/cnn_free.cuda.o \
+		$(BUILDDIR)/cnn_cuda_make.o \
+		$(BUILDDIR)/cnn_cnn.cuda.o \
+		$(BUILDDIR)/cnn_utils.cuda.o \
+		$(BUILDDIR)/cnn_jpeg.cuda.o \
+		\
+		$(BUILDDIR)/cuda_memory_management.o \
+		$(BUILDDIR)/colors.cuda.o \
+		$(BUILDDIR)/mnist.o \
+		$(BUILDDIR)/cuda_utils.o
+	$(NVCC)  $^ -o $@  $(NVCCFLAGS) $(LD_NVCCFLAGS)
+
+
 $(BUILDDIR)/cnn_%.o: $(CNN_SRCDIR)/%.c $(CNN_SRCDIR)/include/%.h
 	$(CC)  -c $< -o $@  $(CFLAGS)
 
diff --git a/src/cnn/export.c b/src/cnn/export.c
index d304ab1..f571125 100644
--- a/src/cnn/export.c
+++ b/src/cnn/export.c
@@ -82,7 +82,7 @@ void print_poids_ker_cnn(char* modele) {
 
 
 void write_image(float** data, int width, int height, char* base_filename, int layer_id, int kernel_id) {
-    int filename_length = strlen(base_filename) + (int)log10(layer_id+1)+1 + (int)log10(kernel_id+1)+1 + 21;
+    int filename_length = strlen(base_filename) + (int)log10(layer_id+1)+1 + (int)log10(kernel_id+1)+1 + 21 +1;
     char* filename = (char*)malloc(sizeof(char)*filename_length);
 
     sprintf(filename, "%s_layer-%d_feature-%d.jpeg", base_filename, layer_id, kernel_id);