diff --git a/tests/asm/BasicLoop.asm b/tests/asm/BasicLoop.asm
index 6454d8a..19d3b29 100644
--- a/tests/asm/BasicLoop.asm
+++ b/tests/asm/BasicLoop.asm
@@ -8,3 +8,4 @@ loop:
   SUB t1, t1, t2
   BNE t1, zero, loop
 # END
+  ECALL
diff --git a/tests/asm/BasicRegisters.asm b/tests/asm/BasicRegisters.asm
index 06dd943..5a715a4 100644
--- a/tests/asm/BasicRegisters.asm
+++ b/tests/asm/BasicRegisters.asm
@@ -9,3 +9,4 @@ ADD t4, t1, t2
 ADD t5, t2, t3
 SUB t6, t2, t1
 #SUB t7, t1, t2
+ECALL
diff --git a/tests/asm/Memoryaccess.asm b/tests/asm/Memoryaccess.asm
index c1ccc5e..4fafbbb 100644
--- a/tests/asm/Memoryaccess.asm
+++ b/tests/asm/Memoryaccess.asm
@@ -6,3 +6,4 @@ sb t3, -13(t2)
 li t1, 23
 lbu t1, -6(t2)
 lbu t3, -13(t2)
+ecall
diff --git a/tests/asm/trace.asm b/tests/asm/trace.asm
index 5c00639..d10d526 100644
--- a/tests/asm/trace.asm
+++ b/tests/asm/trace.asm
@@ -32,3 +32,4 @@ _start:
   sb t0, 0(a2)
   li t0, '\n'
   sb t0, 0(a2)
+  ecall