diff --git a/lcapy/expr.py b/lcapy/expr.py
index 7f6696cd..f487e50a 100644
--- a/lcapy/expr.py
+++ b/lcapy/expr.py
@@ -1324,7 +1324,7 @@ def __compat_add__(self, x, op):
     def __mul__(self, x):
         """Multiply."""
 
-        from .super import Superposition
+        from .superposition import Superposition
 
         if isinstance(x, Superposition):
             return x.__mul__(self)
@@ -1539,7 +1539,7 @@ def __radd__(self, x):
     def __sub__(self, x):
         """Subtract."""
 
-        from .super import Superposition
+        from .superposition import Superposition
 
         if isinstance(x, Superposition):
             return -x + self
diff --git a/lcapy/exprdomain.py b/lcapy/exprdomain.py
index 6caf59d5..749d2aa6 100644
--- a/lcapy/exprdomain.py
+++ b/lcapy/exprdomain.py
@@ -84,7 +84,7 @@ def as_constant(self):
     def as_superposition(self):
         from .superpositionvoltage import SuperpositionVoltage
         from .superpositioncurrent import SuperpositionCurrent
-        from .super import Superposition
+        from .superposition import Superposition
 
         if self.is_voltage:
             return SuperpositionVoltage(self)
diff --git a/lcapy/super.py b/lcapy/superposition.py
similarity index 100%
rename from lcapy/super.py
rename to lcapy/superposition.py
diff --git a/lcapy/superpositioncurrent.py b/lcapy/superpositioncurrent.py
index 4d2561e7..055d13d9 100644
--- a/lcapy/superpositioncurrent.py
+++ b/lcapy/superpositioncurrent.py
@@ -26,7 +26,7 @@
 
 """
 
-from .super import Superposition
+from .superposition import Superposition
 from .symbols import j, omega
 from .impedance import impedance
 from .currentmixin import CurrentMixin
diff --git a/lcapy/superpositionvoltage.py b/lcapy/superpositionvoltage.py
index cb418c20..7f5a2285 100644
--- a/lcapy/superpositionvoltage.py
+++ b/lcapy/superpositionvoltage.py
@@ -26,7 +26,7 @@
 
 """
 
-from .super import Superposition
+from .superposition import Superposition
 from .symbols import j, omega
 from .admittance import admittance
 from .voltagemixin import VoltageMixin
diff --git a/lcapy/transform.py b/lcapy/transform.py
index e6224a41..de55eb1e 100644
--- a/lcapy/transform.py
+++ b/lcapy/transform.py
@@ -169,7 +169,7 @@ def select(expr, kind):
 from .nexpr import DiscreteTimeDomainExpression  # nopep8
 from .kexpr import DiscreteFourierDomainExpression  # nopep8
 from .zexpr import ZDomainExpression  # nopep8
-from .super import Superposition  # nopep8
+from .superposition import Superposition  # nopep8
 from .current import current  # nopep8
 from .voltage import voltage  # nopep8
 from .admittance import admittance  # nopep8