diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0ac7456..952ac3b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@ project(libabacus)
 
 add_compile_options(-pedantic -Wall)
 
-add_library(abacus STATIC src/lexer.c src/util.c src/table.c src/parser.c src/libabacus.c src/tree.c src/debug.c src/parsetype.c src/reserved.c src/trie.c src/refcount.c src/ref_vec.c src/ref_trie.c src/basetype.c src/value.c src/custom.c src/interpreter.c src/function_list.c src/free_functions.c)
+add_library(abacus STATIC src/lexer.c src/util.c src/table.c src/parser.c src/libabacus.c src/tree.c src/debug.c src/parsetype.c src/reserved.c src/trie.c src/refcount.c src/ref_vec.c src/ref_trie.c src/basetype.c src/value.c src/custom.c src/interpreter.c src/function_list.c src/free_functions.c src/gc.c)
 add_executable(libabacus src/main.c)
 add_executable(interactive src/interactive.c)
 add_subdirectory(external/liblex)
@@ -20,4 +20,4 @@ target_include_directories(libabacus PUBLIC include)
 
 target_link_libraries(abacus lex)
 target_link_libraries(libabacus abacus)
-target_link_libraries(interactive abacus)
+target_link_libraries(interactive abacus m)
diff --git a/include/gc.h b/include/gc.h
new file mode 100644
index 0000000..835d573
--- /dev/null
+++ b/include/gc.h
@@ -0,0 +1,33 @@
+#ifndef LIBABACUS_GC_H
+#define LIBABACUS_GC_H
+
+struct libab_ref_s;
+struct libab_ref_count_s;
+
+/**
+ * Struct used to create an interface
+ * for a set of objects to be collected.
+ */
+struct libab_gc_list_s {
+    /**
+     * The head of the linked list.
+     */
+    struct libab_ref_count_s* head;
+    /**
+     * The tail of the linked list.
+     */
+    struct libab_ref_count_s* tail;
+};
+
+typedef struct libab_gc_list_s libab_gc_list;
+typedef void (*libab_visitor_function_ptr)(struct libab_ref_count_s* , void*);
+typedef void (*libab_visit_function_ptr)(void*, libab_visitor_function_ptr, void*);
+
+void libab_gc_list_init(libab_gc_list* list);
+void libab_gc_visit(struct libab_ref_s*, libab_visitor_function_ptr visitor, void*);
+void libab_gc_add(struct libab_ref_s* ref,
+                      libab_visit_function_ptr visit_children,
+                      libab_gc_list* list);
+void libab_gc_run(libab_gc_list* list);
+
+#endif
diff --git a/include/refcount.h b/include/refcount.h
index 5f8b7a3..0c24ee2 100644
--- a/include/refcount.h
+++ b/include/refcount.h
@@ -2,12 +2,7 @@
 #define LIBABACUS_REFCOUNT_H
 
 #include "result.h"
-
-struct libab_ref_s;
-struct libab_ref_count_s;
-
-typedef void (*libab_visitor_function_ptr)(struct libab_ref_count_s* , void*);
-typedef void (*libab_visit_function_ptr)(void*, libab_visitor_function_ptr, void*);
+#include "gc.h"
 
 /**
  * A struct for holding
@@ -57,21 +52,6 @@ struct libab_ref_count_s {
     libab_visit_function_ptr visit_children;
 };
 
-/**
- * Struct used to create an interface
- * for a set of objects to be collected.
- */
-struct libab_ref_gc_list_s {
-    /**
-     * The head of the linked list.
-     */
-    struct libab_ref_count_s* head;
-    /**
-     * The tail of the linked list.
-     */
-    struct libab_ref_count_s* tail;
-};
-
 /**
  * A reference to a value.
  */
@@ -93,7 +73,6 @@ struct libab_ref_s {
 
 typedef struct libab_ref_s libab_ref;
 typedef struct libab_ref_count_s libab_ref_count;
-typedef struct libab_ref_gc_list_s  libab_ref_gc_list;
 
 /**
  * Creates a new referene, using the given data and free function.
@@ -111,11 +90,6 @@ libab_result libab_ref_new(libab_ref* ref, void* data,
  * @param ref the reference to initialize with null.
  */
 void libab_ref_null(libab_ref* ref);
-void libab_ref_gc_visit(libab_ref*, libab_visitor_function_ptr visitor, void*);
-void libab_ref_gc_add(libab_ref* ref,
-                      libab_visit_function_ptr visit_children,
-                      libab_ref_gc_list* list);
-void libab_ref_gc_run(libab_ref_gc_list* list);
 /**
  * Turns the given reference into a weak reference,
  * making it not keep the data allocated.
diff --git a/src/gc.c b/src/gc.c
new file mode 100644
index 0000000..f2c171d
--- /dev/null
+++ b/src/gc.c
@@ -0,0 +1,77 @@
+#include "gc.h"
+#include "refcount.h"
+#include <stdlib.h>
+
+void libab_gc_list_init(libab_gc_list* list) {
+    list->head = list->tail = NULL;
+}
+
+void _gc_count_visit(libab_ref_count* ref, libab_visitor_function_ptr func, void* data) {
+    if(ref->strong && ref->visit_children) ref->visit_children(ref->data, func, data);
+}
+void libab_gc_visit(libab_ref* ref, libab_visitor_function_ptr func, void* data) {
+    _gc_count_visit(ref->count, func, data);
+}
+
+void _libab_gc_list_append(libab_gc_list* list,
+                               libab_ref_count* node) {
+    if(node->next) node->next->prev = node->prev;
+    if(node->prev) node->prev->next = node->next;
+
+    node->prev = list->tail;
+    node->next = NULL;
+    if(list->head) {
+        list->tail->next = node;
+    } else {
+        list->head = node;
+    }
+    list->tail = node;
+}
+void libab_gc_add(libab_ref* ref,
+                      libab_visit_function_ptr visit_children,
+                      libab_gc_list* list) {
+    ref->count->visit_children = visit_children;
+    _libab_gc_list_append(list, ref->count);
+}
+
+void _gc_decrement(libab_ref_count* count, void* data) {
+    count->gc--;
+}
+void _gc_save(libab_ref_count* count, void* data) {
+    libab_gc_list* list = data;
+    if(count->gc != -1) {
+        count->gc = -1;
+        _libab_gc_list_append(list, count);
+        _gc_count_visit(count, _gc_save, data);
+    }
+}
+
+void libab_gc_run(libab_gc_list* list) {
+    libab_gc_list safe;
+    libab_ref_count* head;
+    size_t count = 0;
+
+    head = list->head;
+    while(head) {
+        head->gc = head->weak;
+    }
+
+    head = list->head;
+    while(head) {
+        _gc_count_visit(head, _gc_decrement, NULL);
+    }
+
+    head = list->head;
+    while(head) {
+        _gc_count_visit(head, _gc_save, &safe);
+    }
+
+    head = list->head;
+    while(head) {
+        count++;
+    }
+    printf("Can free %d\n", count);
+
+    list->head = safe.head;
+    list->tail = safe.tail;
+}
diff --git a/src/refcount.c b/src/refcount.c
index 5066b07..97226c1 100644
--- a/src/refcount.c
+++ b/src/refcount.c
@@ -21,76 +21,6 @@ libab_result libab_ref_new(libab_ref* ref, void* data,
 
 void libab_ref_null(libab_ref* ref) { ref->null = 1; }
 
-void _ref_gc_count_visit(libab_ref_count* ref, libab_visitor_function_ptr func, void* data) {
-    if(ref->strong && ref->visit_children) ref->visit_children(ref->data, func, data);
-}
-void libab_ref_gc_visit(libab_ref* ref, libab_visitor_function_ptr func, void* data) {
-    _ref_gc_count_visit(ref->count, func, data);
-}
-
-void _libab_ref_gc_list_append(libab_ref_gc_list* list,
-                               libab_ref_count* node) {
-    if(node->next) node->next->prev = node->prev;
-    if(node->prev) node->prev->next = node->next;
-
-    node->prev = list->tail;
-    node->next = NULL;
-    if(list->head) {
-        list->tail->next = node;
-    } else {
-        list->head = node;
-    }
-    list->tail = node;
-}
-void libab_ref_gc_add(libab_ref* ref,
-                      libab_visit_function_ptr visit_children,
-                      libab_ref_gc_list* list) {
-    ref->count->visit_children = visit_children;
-    _libab_ref_gc_list_append(list, ref->count);
-}
-
-void _ref_gc_decrement(libab_ref_count* count, void* data) {
-    count->gc--;
-}
-void _ref_gc_save(libab_ref_count* count, void* data) {
-    libab_ref_gc_list* list = data;
-    if(count->gc != -1) {
-        count->gc = -1;
-        _libab_ref_gc_list_append(list, count);
-        _ref_gc_count_visit(count, _ref_gc_save, data);
-    }
-}
-
-void libab_ref_gc_run(libab_ref_gc_list* list) {
-    libab_ref_gc_list safe;
-    libab_ref_count* head;
-    size_t count = 0;
-
-    head = list->head;
-    while(head) {
-        head->gc = head->weak;
-    }
-
-    head = list->head;
-    while(head) {
-        _ref_gc_count_visit(head, _ref_gc_decrement, NULL);
-    }
-
-    head = list->head;
-    while(head) {
-        _ref_gc_count_visit(head, _ref_gc_save, &safe);
-    }
-
-    head = list->head;
-    while(head) {
-        count++;
-    }
-    printf("Can free %d\n", count);
-
-    list->head = safe.head;
-    list->tail = safe.tail;
-}
-
 void _libab_ref_changed(libab_ref* ref) {
     if (ref->count->strong == 0) {
         ref->count->strong--;