diff --git a/openmc/capi/filter.py b/openmc/capi/filter.py
index f1f0cdc46d..92818a2aa1 100644
--- a/openmc/capi/filter.py
+++ b/openmc/capi/filter.py
@@ -221,9 +221,18 @@ class EnergyFunctionFilter(Filter):
             raise AttributeError("Need both energy and y or neither")
         super().__init__(uid, new, index)
         if energy is not None:
-            self.set_interp_data(energy, y)
+            self.set_data(energy, y)
 
-    def set_interp_data(self, energy, y):
+    def set_data(self, energy, y):
+        """Set the interpolation information for the filter
+
+        Parameters
+        ----------
+        energy : numpy.ndarray
+            Independent variable for the interpolation
+        y : numpy.ndarray
+            Dependent variable for the interpolation
+        """
         energy_array = np.asarray(energy)
         y_array = np.asarray(y)
         energy_p = energy_array.ctypes.data_as(POINTER(c_double))
diff --git a/src/tallies/filter_energyfunc.cpp b/src/tallies/filter_energyfunc.cpp
index cf74d9836c..3e3fbd909c 100644
--- a/src/tallies/filter_energyfunc.cpp
+++ b/src/tallies/filter_energyfunc.cpp
@@ -94,7 +94,7 @@ EnergyFunctionFilter::text_label(int bin) const
 // C-API functions
 //==============================================================================
 
-extern"C" int
+extern "C" int
 openmc_energyfunc_filter_set_data(int32_t index, size_t n, const double* energy,
                                   const double* y)
 {
@@ -116,7 +116,7 @@ openmc_energyfunc_filter_set_data(int32_t index, size_t n, const double* energy,
   return 0;
 }
 
-extern"C" int
+extern "C" int
 openmc_energyfunc_filter_get_energy(int32_t index, size_t *n, const double** energy)
 {
   // ensure this is a valid index to allocated filter
@@ -137,7 +137,7 @@ openmc_energyfunc_filter_get_energy(int32_t index, size_t *n, const double** ene
   return 0;
 }
 
-extern"C" int
+extern "C" int
 openmc_energyfunc_filter_get_y(int32_t index, size_t *n, const double** y)
 {
   // ensure this is a valid index to allocated filter
diff --git a/tests/unit_tests/test_capi.py b/tests/unit_tests/test_capi.py
index 57978838f7..ed0bfd441d 100644
--- a/tests/unit_tests/test_capi.py
+++ b/tests/unit_tests/test_capi.py
@@ -234,7 +234,7 @@ def test_tally(capi_init):
     assert isinstance(t3_f, openmc.capi.EnergyFunctionFilter)
     assert len(t3_f.energy) == 2
     assert len(t3_f.y) == 2
-    t3_f.set_interp_data([0.0, 1.0, 2.0], [0.0, 1.0, 4.0])
+    t3_f.set_data([0.0, 1.0, 2.0], [0.0, 1.0, 4.0])
     assert len(t3_f.energy) == 3
     assert len(t3_f.y) == 3