diff --git a/tensor.c b/tensor.c
index ac4f2fd..c9c5068 100644
--- a/tensor.c
+++ b/tensor.c
@@ -15,7 +15,7 @@ void tensor_destroy(tensor t)
 	}
 }
 
-int tensor_is_empty(tensor t){
+int tensor_is_empty(const tensor t){
 	return t->elements == NULL || t->size == NULL;
 }
 
@@ -80,7 +80,7 @@ int tensor_set(tensor t, const int *index, t_type val)
 	return 1;
 }
 
-t_type tensor_get(tensor t, const int *index, int *success)
+t_type tensor_get(const tensor t, const int *index, int *success)
 {
 	int i, offset = 0;
 	if(tensor_is_empty(t)) return 0;
@@ -141,7 +141,7 @@ void tensor_for_each_elem(tensor t, t_type (*func)(t_type))
 	}
 }
 
-void tensor_print(tensor t)
+void tensor_print(const tensor t)
 {
 	int i, j;
 	int *indx;
diff --git a/tensor.h b/tensor.h
index 00ecde1..8c10292 100644
--- a/tensor.h
+++ b/tensor.h
@@ -21,20 +21,20 @@ typedef struct _tensor {
 tensor tensor_new(void);
 void tensor_destroy(tensor t);
 
-int tensor_is_empty(tensor t);
+int tensor_is_empty(const tensor t);
 
 int _tensor_check_size(const int *size, int dim);
 int _tensor_set_size(tensor t, const int *size, int dim);
 
 int tensor_set(tensor t, const int *index, t_type val);
-t_type tensor_get(tensor t, const int *index, int *success);
+t_type tensor_get(const tensor t, const int *index, int *success);
 
 int tensor_init_one(tensor t, int dimension, const int *size);
 int tensor_init_zero(tensor t, int dimension, const int *size);
 int tensor_init_rand(tensor t, int dimension, const int *size);
 
 void tensor_for_each_elem(tensor t, t_type (*func)(t_type));
-void tensor_print(tensor t);
+void tensor_print(const tensor t);
 
 #endif