diff --git a/python/classy.pyx b/python/classy.pyx
index eefdc2cc0..1e52511f4 100644
--- a/python/classy.pyx
+++ b/python/classy.pyx
@@ -1092,6 +1092,9 @@ cdef class Class:
             for index in range(timesteps):
                 background[names[i]][index] = data[index*number_of_titles+i]
 
+        free(titles)
+        free(data)
+
         return background
 
     def get_thermodynamics(self):
@@ -1128,6 +1131,9 @@ cdef class Class:
             for index in range(timesteps):
                 thermodynamics[names[i]][index] = data[index*number_of_titles+i]
 
+        free(titles)
+        free(data)
+
         return thermodynamics
 
     def get_primordial(self):
@@ -1165,6 +1171,9 @@ cdef class Class:
             for index in range(timesteps):
                 primordial[names[i]][index] = data[index*number_of_titles+i]
 
+        free(titles)
+        free(data)
+
         return primordial
 
 
@@ -1319,6 +1328,9 @@ cdef class Class:
             else:
                 spectra[ic_key] = tmpdict
 
+        free(titles)
+        free(data)
+
         return spectra