diff --git a/python/src/qmckl.i b/python/src/qmckl.i
index 79b0229..76258c0 100644
--- a/python/src/qmckl.i
+++ b/python/src/qmckl.i
@@ -51,6 +51,11 @@ import_array();
 /* Include typemaps generated by the process_header.py script */
 %include "qmckl_include.i"
 
+/* Some custom array typemaps which are not generated by process_header.py */
+%apply ( double* IN_ARRAY1 , int64_t DIM1 ) { ( const double * A, const int64_t size_max_A) };
+%apply ( double* IN_ARRAY1 , int64_t DIM1 ) { ( const double * B, const int64_t size_max_B) };
+%apply ( double* ARGOUT_ARRAY1 , int64_t DIM1 ) { ( double* const C, const int64_t size_max_C) };
+
 /* Handle properly get_point */