diff --git a/integration_tests/test_gruntz.py b/integration_tests/test_gruntz.py
index 376f68495a..33b940f86f 100644
--- a/integration_tests/test_gruntz.py
+++ b/integration_tests/test_gruntz.py
@@ -1,5 +1,5 @@
 from lpython import S
-from sympy import Symbol
+from sympy import Symbol, log
 
 def mmrv(e: S, x: S) -> list[S]:
     if not e.has(x):
@@ -8,6 +8,10 @@ def mmrv(e: S, x: S) -> list[S]:
     elif e == x:
         list1: list[S] = [x]
         return list1
+    elif e.func == log:
+        arg0: S = e.args[0]
+        list2: list[S] = mmrv(arg0, x)
+        return list2
     else:
         raise
 
@@ -26,4 +30,11 @@ def test_mrv():
     assert ele1 == x
     assert len(ans2) == 1
 
+    # Case 3
+    ans3: list[S] = mmrv(log(x), x)
+    ele2: S = ans3[0]
+    print(ele2)
+    assert ele2 == x
+    assert len(ans2) == 1
+
 test_mrv()
\ No newline at end of file