diff --git a/assembleur.s b/assembleur.s
index ac3667856610dc4224c8ed8c85a625cd8ff7027a..24a7831691ebd978b26f5def6232c607a849003f 100644
--- a/assembleur.s
+++ b/assembleur.s
@@ -22,12 +22,11 @@ switch_to_user_mode:
 // R0: user_starting_address
 /*************************/
 change_ret:
-	ldr r1, =user_stack
-	//mrs r1, PSP
-	//str r0, [r1, #76]
+	mrs r1, PSP
+	ldr r1, [r1]
 	str r0, [r1, #24]
 	msr PSP, r1
-	bx lr
+	bx 	lr
 
 .equ bad_addr,0x90000
 
diff --git a/mpu_user_console_etu.c b/mpu_user_console_etu.c
index b94622176d6a0da8b41d1d12668ab6c3c7bba27b..1439a822d865be69a11445f47b97b2f8d85f2f27 100644
--- a/mpu_user_console_etu.c
+++ b/mpu_user_console_etu.c
@@ -120,7 +120,7 @@ int main(void) {
 	switch_to_user_mode();					// to be implemented
 
 	// testing memory accesses in user mode:
-	//test_user_mode();		// to be removed after checking
+	test_user_mode();		// to be removed after checking
 
 	while (1) {
 		exec_user_read_write();