diff --git a/cmake/NeuronFileLists.cmake b/cmake/NeuronFileLists.cmake
index 789867c6a3..2c376847e1 100644
--- a/cmake/NeuronFileLists.cmake
+++ b/cmake/NeuronFileLists.cmake
@@ -35,8 +35,8 @@ set(HEADER_FILES_TO_INSTALL
     nrnoc/options.h
     nrnoc/section_fwd.hpp
     nrnoc/treeset.h
+    oc/classreg.h
     oc/hoc.h
-    oc/hoc_membf.h
     oc/hocassrt.h
     oc/hocdec.h
     oc/hocgetsym.h
diff --git a/src/nrnoc/init.cpp b/src/nrnoc/init.cpp
index 963736f2b2..5a190ee06f 100644
--- a/src/nrnoc/init.cpp
+++ b/src/nrnoc/init.cpp
@@ -1021,8 +1021,8 @@ int point_reg_helper(Symbol* s2) {
 }
 
 extern void class2oc_base(const char*,
-                          void* (*cons)(Object*),
-                          void (*destruct)(void*),
+                          ctor_f* cons,
+                          dtor_f* destruct,
                           Member_func*,
                           Member_ret_obj_func*,
                           Member_ret_str_func*);
diff --git a/src/nrnoc/nrniv_mf.h b/src/nrnoc/nrniv_mf.h
index 1a1c016daa..3d28a0cbec 100644
--- a/src/nrnoc/nrniv_mf.h
+++ b/src/nrnoc/nrniv_mf.h
@@ -1,5 +1,5 @@
 #pragma once
-#include "hoc_membf.h"
+#include "classreg.h"
 #include "hocdec.h"
 #include "membfunc.h"
 
@@ -51,8 +51,8 @@ int point_register_mech(const char**,
                         nrn_init_t,
                         int,
                         int,
-                        void* (*) (Object*),
-                        void (*)(void*),
+                        ctor_f*,
+                        dtor_f*,
                         Member_func*);
 extern int nrn_get_mechtype(const char*);
 extern void nrn_writes_conc(int, int);
diff --git a/src/nrnoc/seclist.cpp b/src/nrnoc/seclist.cpp
index f5562c31ae..d1509e2a00 100644
--- a/src/nrnoc/seclist.cpp
+++ b/src/nrnoc/seclist.cpp
@@ -6,7 +6,7 @@
 #include "parse.hpp"
 #include "hocparse.h"
 #include "code.h"
-#include "hoc_membf.h"
+#include "classreg.h"
 
 /* needs trailing '}' */
 #define ITERATE_REMOVE(q1, q2, lst)                \
@@ -252,15 +252,6 @@ static Member_func members[] = {{"append", append},
                                 {"allroots", allroots},
                                 {nullptr, nullptr}};
 
-
-extern void class2oc(const char*,
-                     void* (*cons)(Object*),
-                     void (*destruct)(void*),
-                     Member_func*,
-                     Member_ret_obj_func*,
-                     Member_ret_str_func*);
-
-
 void SectionList_reg(void) {
     /*	printf("SectionList_reg\n");*/
     class2oc("SectionList", constructor, destructor, members, nullptr, nullptr);
diff --git a/src/nrnoc/secref.cpp b/src/nrnoc/secref.cpp
index 38a2ad7277..d835ed4532 100644
--- a/src/nrnoc/secref.cpp
+++ b/src/nrnoc/secref.cpp
@@ -18,7 +18,7 @@ access s1.sec	// soma becomes the default section
 #include <stdlib.h>
 #include "section.h"
 #include "parse.hpp"
-#include "hoc_membf.h"
+#include "classreg.h"
 #include "oc_ansi.h"
 
 extern int hoc_return_type_code;
@@ -361,15 +361,6 @@ Section* nrn_sectionref_steer(Section* sec, Symbol* sym, int* pnindex) {
     return s;
 }
 
-
-extern void class2oc(const char*,
-                     void* (*cons)(Object*),
-                     void (*destruct)(void*),
-                     Member_func*,
-                     Member_ret_obj_func*,
-                     Member_ret_str_func*);
-
-
 void SectionRef_reg(void) {
     Symbol *s, *sr;
 
diff --git a/src/oc/classreg.h b/src/oc/classreg.h
index 00ee7e9a55..6aaea74528 100644
--- a/src/oc/classreg.h
+++ b/src/oc/classreg.h
@@ -1,11 +1,27 @@
 #pragma once
 
-#include <hocdec.h>
-#include <hoc_membf.h>
-
-extern void class2oc(const char*,
-                     void* (*cons)(Object*),
-                     void (*destruct)(void*),
-                     Member_func*,
-                     Member_ret_obj_func*,
-                     Member_ret_str_func*);
+struct Object;
+
+using ctor_f = void*(Object*);
+using dtor_f = void(void*);
+
+struct Member_func {
+    const char* name;
+    double (*member)(void*);
+};
+
+struct Member_ret_obj_func {
+    const char* name;
+    struct Object** (*member)(void*);
+};
+
+struct Member_ret_str_func {
+    const char* name;
+    const char** (*member)(void*);
+};
+void class2oc(const char*,
+              ctor_f* cons,
+              dtor_f* destruct,
+              Member_func*,
+              Member_ret_obj_func*,
+              Member_ret_str_func*);
diff --git a/src/oc/hoc_membf.h b/src/oc/hoc_membf.h
deleted file mode 100644
index 9ac37cba06..0000000000
--- a/src/oc/hoc_membf.h
+++ /dev/null
@@ -1,18 +0,0 @@
-#pragma once
-
-struct Object;
-
-typedef struct Member_func {
-    const char* name;
-    double (*member)(void*);
-} Member_func;
-
-typedef struct Member_ret_obj_func {
-    const char* name;
-    struct Object** (*member)(void*);
-} Member_ret_obj_func;
-
-typedef struct Member_ret_str_func {
-    const char* name;
-    const char** (*member)(void*);
-} Member_ret_str_func;
diff --git a/src/oc/hoc_oop.cpp b/src/oc/hoc_oop.cpp
index bf485698f1..cca4bd8647 100644
--- a/src/oc/hoc_oop.cpp
+++ b/src/oc/hoc_oop.cpp
@@ -1581,8 +1581,8 @@ void hoc_endtemplate(Symbol* t) {
 }
 
 void class2oc_base(const char* name,
-                   void* (*cons)(Object*),
-                   void (*destruct)(void*),
+                   ctor_f* cons,
+                   dtor_f* destruct,
                    Member_func* m,
                    Member_ret_obj_func* mobjret,
                    Member_ret_str_func* strret) {
@@ -1629,8 +1629,8 @@ void class2oc_base(const char* name,
 
 
 void class2oc(const char* name,
-              void* (*cons)(Object*),
-              void (*destruct)(void*),
+              ctor_f* cons,
+              dtor_f* destruct,
               Member_func* m,
               Member_ret_obj_func* mobjret,
               Member_ret_str_func* strret) {
diff --git a/test/unit_tests/oc/hoc_interpreter.cpp b/test/unit_tests/oc/hoc_interpreter.cpp
index 3e334bfcb1..21338018d2 100644
--- a/test/unit_tests/oc/hoc_interpreter.cpp
+++ b/test/unit_tests/oc/hoc_interpreter.cpp
@@ -5,7 +5,7 @@
 #include "classreg.h"
 #include "code.h"
 #include "hocdec.h"
-#include "hoc_membf.h"
+#include "classreg.h"
 #include "ocfunc.h"
 
 #include <sstream>