diff --git a/1_numpy_matplotlib_scipy_sympy/5-sympy_tutorial.ipynb b/1_numpy_matplotlib_scipy_sympy/5-sympy_tutorial.ipynb
index 65eb55fa12c64889d18b61a89a468d54b3550e64..a97ed55db7e58f783f76a2449517ff1dc1c79d36 100644
--- a/1_numpy_matplotlib_scipy_sympy/5-sympy_tutorial.ipynb
+++ b/1_numpy_matplotlib_scipy_sympy/5-sympy_tutorial.ipynb
@@ -1837,7 +1837,7 @@
    },
    "outputs": [],
    "source": [
-    "h = Symbol(\"h\")"
+    "h = sp.Symbol(\"h\")"
    ]
   },
   {
@@ -2121,7 +2121,7 @@
     }
    ],
    "source": [
-    "expand(s1 * s2)"
+    "sp.expand(s1 * s2)"
    ]
   },
   {