diff --git a/CMakeLists.txt b/CMakeLists.txt
index 40ac8da..919f0f4 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/type.c src/value.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/type.c src/value.c src/custom.c)
 add_executable(libabacus src/main.c)
 add_subdirectory(external/liblex)
 
diff --git a/include/custom.h b/include/custom.h
index 92ed12c..6db76d7 100644
--- a/include/custom.h
+++ b/include/custom.h
@@ -76,4 +76,20 @@ typedef struct libab_behavior_s libab_behavior;
 typedef struct libab_operator_s libab_operator;
 typedef struct libab_function_s libab_function;
 
+/**
+ * Frees the given behavior.
+ * @param behavior the behavior to free.
+ */
+void libab_behavior_free(libab_behavior* behavior);
+/**
+ * Frees the given operator.
+ * @param op the operator to free.
+ */
+void libab_operator_free(libab_operator* op);
+/**
+ * Frees the given function.
+ * @param fun the function to free.
+ */
+void libab_function_free(libab_function* fun);
+
 #endif
diff --git a/src/custom.c b/src/custom.c
new file mode 100644
index 0000000..dc2afae
--- /dev/null
+++ b/src/custom.c
@@ -0,0 +1,13 @@
+#include "custom.h"
+
+void libab_behavior_free(libab_behavior* behavior) {
+    libab_parsetype_free_recursive(behavior->type);
+}
+
+void libab_operator_free(libab_operator* op) {
+    libab_behavior_free(&op->behavior);
+}
+
+void libab_function_free(libab_function* fun) {
+    libab_behavior_free(&fun->behavior);
+}
diff --git a/src/table.c b/src/table.c
index 6c7f0ec..bb88261 100644
--- a/src/table.c
+++ b/src/table.c
@@ -69,8 +69,8 @@ void libab_table_free(libab_table* table) {
 }
 void libab_table_entry_free(libab_table_entry* entry) {
     if(entry->variant == ENTRY_OP) {
-        libab_parsetype_free_recursive(entry->data_u.op.behavior.type);
+        libab_operator_free(&entry->data_u.op);
     } else if(entry->variant == ENTRY_FUN) {
-        libab_parsetype_free_recursive(entry->data_u.function.behavior.type);
+        libab_function_free(&entry->data_u.function);
     }
 }